[Federal Register: June 16, 2010 (Volume 75, Number 115)]
[Rules and Regulations]
[Page 34017-34040]
[DOCID:fr16jn10-10]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 82

[FRL-9163-5]
RIN 2060-AG12

Protection of Stratospheric Ozone: Notice 25 for Significant New
Alternatives Policy Program

AGENCY: Environmental Protection Agency (EPA).

ACTION: Determination of Acceptability.

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SUMMARY: This Determination of Acceptability expands the list of
acceptable substitutes for ozone-depleting substances under the U.S.
Environmental Protection Agency's Significant New Alternatives Policy
program. The substitutes are for use in the following sectors:
Refrigeration and air-conditioning, foam blowing, aerosols, and
sterilants. The majority of the acceptability decisions find
substitutes acceptable as alternatives to the class II ozone depleting
substances hydrochlorofluorocarbon (HCFC)-22, HCFC-142b and blends
containing one or both of these substances. EPA is also finding one of
the alternatives, HFO-

1234ze, acceptable as a substitute for CFC-113 in the heat transfer end
use and as a substitute for CFC-11 in the aerosol propellant end use.
The listing of additional refrigerant alternatives as acceptable will
provide users in the refrigeration and air-conditioning sector with
more options for replacing HCFC-22 and HCFC-142b, which, pursuant to
EPA's phaseout regulations, may generally be used only as a refrigerant
to service equipment manufactured before January 1, 2010.

DATES: Effective Date: June 16, 2010.

ADDRESSES: EPA has established a docket for this action under Docket ID
No. EPA-HQ-OAR-2003-0118 (continuation of Air Docket A-91-42). All
electronic documents in the docket are listed in the index at http://
www.regulations.gov. Although listed in the index, some information is
not publicly available, i.e., Confidential Business Information (CBI)
or other information whose disclosure is restricted by statute.
Publicly available docket materials are available either electronically
at http://www.regulations.gov or in hard copy at the EPA Air Docket
(No. A-91-42), EPA/DC, EPA West, Room 3334, 1301 Constitution Ave.,
NW., Washington, DC. The Public Reading Room is open from 8:30 a.m. to
4:30 p.m., Monday through Friday, excluding legal holidays. The
telephone number for the Public Reading Room is<PHONE_NUMBER>, and the
telephone number for the Air Docket is<PHONE_NUMBER>.

FOR FURTHER INFORMATION CONTACT: Melissa Fiffer by telephone at (202)
343-9464, by facsimile at<PHONE_NUMBER>, by e-mail at
<EMAIL_ADDRESS>or by mail at U.S. Environmental Protection
Agency, Mail Code 6205J, Washington, DC 20460. Overnight or courier
deliveries should be sent to the office location at 1310 L Street, NW.,
10th floor, Washington, DC 20005.
    For more information on the Agency's process for administering the
Significant New Alternatives Policy (SNAP) program or criteria for
evaluation of substitutes, refer to the original SNAP rulemaking
published in the Federal Register on March 18, 1994 (59 FR 13044).
Notices and rulemakings under the SNAP program, as well as other EPA
publications on protection of stratospheric ozone, are available from
EPA's Ozone Depletion Web site at http://www.epa.gov/ozone/ including
the SNAP portion at http://www.epa.gov/ozone/snap/.

SUPPLEMENTARY INFORMATION:

I. What acronyms and abbreviations are used in this document?
II. How does the Significant New Alternatives Policy (SNAP) program
work?
    A. What are the statutory requirements and authority for the
SNAP program?
    B. What are EPA's regulations implementing Section 612?
    C. How do the regulations for the SNAP program work?
III. How does today's SNAP listing relate to the HCFC phaseout?
    A. Why is EPA issuing a SNAP listing of alternatives to
hydrochlorofluorocarbon (HCFC)-22, HCFC-142b, and blends thereof?
    B. What happened during the most recent milestone in the HCFC
phaseout?
    C. How does today's SNAP listing affect alternatives to HCFCs
other than HCFC-22, HCFC-142b, and blends thereof?
    D. In servicing existing refrigeration or air-conditioning
equipment, may I continue to use refrigerants, previously found
acceptable by SNAP, that contain HCFC-22, HCFC-142b, and blends
thereof?
IV. What are my existing and new options for alternative
refrigerants?
V. What are my existing and new options for alternative foam blowing
agents?
VI. What are my existing and new options for alternative aerosol
propellants?
VII. What are my existing and new options for alternative
sterilants?

I. What acronyms and abbreviations are used in this document?

    Below is a list of acronyms and abbreviations used in this
document.

ACGIH American Conference of Government Industrial Hygienists
AEGL Acute Exposure Guideline Limit
AEL Acceptable Exposure Limit
AIHA American Industrial Hygiene Association
ASHRAE American Society of Heating, Refrigerating and Air-
Conditioning Engineers
CAA Clean Air Act
CAS ID  Chemical Abstract Service Registry Number
CFC Chlorofluorocarbon
CBI Confidential Business Information
CEGL Continuous Exposure Guidance Level
EPA United States Environmental Protection Agency
FIFRA Federal Insecticide, Fungicide, and Rodenticide Act
GWP Global Warming Potential
HAP Hazardous Air Pollutant
HCFC Hydrochlorofluorocarbon
HFC Hydrofluorocarbon
IDLH Immediately Dangerous to Life and Health
IPCC International Panel on Climate Change
NIOSH National Institutes for Occupational Safety and Health
NRC National Research Council
ODP Ozone Depletion Potential
ODS Ozone-Depleting Substance
OSHA Occupational Safety and Health Administration
PEL Permissible Exposure Limit
REL Recommended Exposure Limit
PMN Pre-Manufacture Notice
RCRA Resource Conservation and Recovery Act
SIP State Implementation Plan
SNAP Significant New Alternatives Policy
TLV Threshold Limit Value
TSCA Toxic Substances Control Act
VOC Volatile Organic Compound
WEEL Workplace Environmental Exposure Limit

II. How does the SNAP program work?

A. What are the statutory requirements and authority for the SNAP
program?

    Section 612 of the Clean Air Act (CAA) requires EPA to develop a
program for evaluating alternatives to ozone-depleting substances
(ODS). EPA refers to this program as the SNAP program. The major
provisions of Section 612 are:
1. Rulemaking
    Section 612(c) requires EPA to promulgate rules making it unlawful
to replace any class I (e.g., chlorofluorocarbon, halon, carbon
tetrachloride, methyl chloroform, methyl bromide, and
hydrobromofluorocarbon) or class II (e.g., hydrochlorofluorocarbon)
substance with any substitute that the Administrator determines may
present adverse effects to human health or the environment where the
Administrator has identified an alternative that (1) reduces the
overall risk to human health and the environment, and (2) is currently
or potentially available.
2. Listing of Unacceptable/Acceptable Substitutes
    Section 612(c) requires EPA to publish a list of the substitutes
unacceptable for specific uses and to publish a corresponding list of
acceptable alternatives for specific uses. The list of acceptable
substitutes is found at http://www.epa.gov/ozone/snap/lists/index.html
and the lists of unacceptable substitutes, substitutes acceptable
subject to use conditions and substitutes acceptable subject to
narrowed use limits are found at 40 CFR part 82 subpart G.
3. Petition Process
    Section 612(d) grants the right to any person to petition EPA to
add a substance to, or delete a substance from, the lists published in
accordance with section 612(c). The Agency has 90 days to grant or deny
a petition. Where the Agency grants the petition, EPA must publish the
revised lists within an additional six months.
4. 90-Day Notification
    Section 612(e) directs EPA to require any person who produces a
chemical substitute for a class I substance to notify the Agency not
less than 90 days

before new or existing chemicals are introduced into interstate
commerce for significant new uses as substitutes for a class I
substance. The producer must also provide the Agency with the
producer's unpublished health and safety studies on such substitutes.
5. Outreach
    Section 612(b)(1) states that the Administrator shall seek to
maximize the use of federal research facilities and resources to assist
users of class I and II substances in identifying and developing
alternatives to the use of such substances in key commercial
applications.
6. Clearinghouse
    Section 612(b)(4) requires the Agency to set up a public
clearinghouse of alternative chemicals, product substitutes, and
alternative manufacturing processes that are available for products and
manufacturing processes which use class I and II substances.

B. What are EPA's regulations implementing Section 612?

    On March 18, 1994, EPA published the original rule (59 FR 13044)
establishing the process for administering the SNAP program and issued
EPA's first lists identifying acceptable and unacceptable substitutes
in the major industrial use sectors (40 CFR part 82, subpart G). These
major industrial use sectors are: Refrigeration and air-conditioning;
foam blowing; solvents cleaning; fire suppression and explosion
protection; sterilants; aerosols; adhesives, coatings and inks; and
tobacco expansion. These sectors comprise the principal industrial
sectors that historically consumed the largest volumes of ODS.
    Section 612 of the CAA requires EPA to list as acceptable only
those substitutes that do not present a significantly greater risk to
human health and the environment as compared with other substitutes
that are currently or potentially available.

C. How do the regulations for the SNAP program work?

    Under the SNAP regulations, anyone who plans to market or produce a
substitute to replace a class I or II ODS in one of the eight major
industrial use sectors must provide notice to the Agency, including
health and safety information on the substitute, at least 90 days
before introducing it into interstate commerce.\1\ This requirement
applies to the person planning to introduce the substitute into
interstate commerce, typically chemical manufacturers, but may also
include importers, formulators, equipment manufacturers, or end-users
\2\ when they are responsible for introducing a substitute into
commerce.
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    \1\ As defined at 40 CFR 82.104 ``interstate commerce'' means
the distribution or transportation of any product between one State,
territory, possession or the District of Columbia, and another
State, territory, possession or the District of Columbia, or the
sale, use or manufacture of any product in more than one State,
territory, possession or District of Columbia. The entry points for
which a product is introduced into interstate commerce are the
release of a product from the facility in which the product was
manufactured, the entry into a warehouse from which the domestic
manufacturer releases the product for sale or distribution, and at
the site of United States Customs clearance.
    \2\ As defined at 40 CFR 82.17 ``end-use'' means processes or
classes of specific applications within major industrial sectors
where a substitute is used to replace an ozone-depleting substance.
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    The Agency has identified four possible decision categories for
substitutes: Acceptable; acceptable subject to use conditions;
acceptable subject to narrowed use limits; and unacceptable. Use
conditions and narrowed use limits are both considered ``use
restrictions'' and are explained below. Substitutes that are deemed
acceptable with no use restrictions (no use conditions or narrowed use
limits) can be used for all applications within the relevant end-uses
within the sector. Substitutes that are acceptable subject to use
restrictions may be used only in accordance with those restrictions. It
is a violation of the CAA and EPA's regulations to replace an ODS with
a substitute listed as unacceptable, except for certain exceptions
(e.g., test marketing, research and development) specified by the
regulation.
    After reviewing a substitute, the Agency may determine that a
substitute is acceptable only if certain conditions in the way that the
substitute is used are met to minimize risks to human health and the
environment. EPA describes such substitutes as ``acceptable subject to
use conditions.'' Entities that use these substitutes without meeting
the associated use conditions are in violation of section 612 of the
CAA and EPA's SNAP regulations.
    For some substitutes, the Agency may permit a narrowed range of use
within an end-use or sector. For example, the Agency may limit the use
of a substitute to certain end-uses or specific applications within an
industry sector. The Agency requires a user of a narrowed use
substitute to demonstrate that no other acceptable substitutes are
available for their specific application by conducting comprehensive
studies. EPA describes these substitutes as ``acceptable subject to
narrowed use limits.'' A person using a substitute that is acceptable
subject to narrowed use limits in applications and end-uses that are
not consistent with the narrowed use limit, are using these substitutes
in an unacceptable manner and are in violation of section 612 of the
CAA and EPA's SNAP regulations.
    The Agency publishes its SNAP program decisions in the Federal
Register (FR). EPA first proposes decisions concerning substitutes that
are deemed acceptable subject to use restrictions (use conditions and/
or narrowed use limits), or for substitutes deemed unacceptable, to
allow the public opportunity to comment. After consideration of the
public comments, EPA publishes a final decision.
    In contrast, EPA publishes decisions that substitutes are
acceptable with no restrictions in ``notices of acceptability'' without
first issuing a proposed decision. As described in the rule initially
implementing the SNAP program (59 FR 13044), EPA does not believe that
notice-and-comment rulemaking procedures are necessary to list
alternatives that are acceptable without restrictions because such
listings neither impose any sanction nor prevent anyone from using a
substitute.
    Many SNAP listings include ``comments'' or ``further information''
to provide additional information on substitutes. Since this additional
information is not part of the regulatory decision, these statements
are not binding for use of the substitute under the SNAP program.
However, regulatory requirements so listed are binding under other
regulatory programs. The ``further information'' classification does
not necessarily include all other legal obligations pertaining to the
use of the substitute. While the items listed are not legally binding
under the SNAP program, EPA encourages users of substitutes to apply
all statements in the ``comments'' or ``further information'' column in
their use of these substitutes. In many instances, the information
simply refers to sound operating practices that have already been
identified in existing industry and/or building-codes or standards.
Thus, many of the statements, if adopted, would not require the
affected user to make significant changes in existing operating
practices.

III. How does today's SNAP listing relate to the HCFC phaseout?

A. Why is EPA issuing a SNAP listing of alternatives to HCFC-22, HCFC-
142b, and blends thereof?

    To date, EPA has listed many HCFCs as acceptable substitutes for
class I ODS thus allowing their use as substitutes for CFCs and for
halons under SNAP. As production and importation of HCFCs becomes more
limited, availability of these substances for use in current end uses
may be limited.\3\ In addition, EPA's phaseout regulations contain some
use restrictions for specific substances. In particular, per the most
recent milestone in the HCFC phaseout, as of January 1, 2010, virgin
HCFC-22 and HCFC-142b, and blends containing one or both of these
compounds, may only be used as refrigerants to service existing
equipment (minor exceptions apply: Please see details in B, below).
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    \3\ A SNAP listing is not equivalent to an allocation, i.e.,
SNAP acceptability does not equate to authorization to produce or
import ODS. EPA lists companies that have been allocated production
and consumption allowances of HCFCs in 40 CFR 82.17 and 82.19.
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    In previous SNAP notices, EPA has listed a number of acceptable
substitutes for HCFC-22, HCFC-142b, and blends containing one or both
of these chemical compounds (``blends thereof''). In today's SNAP
listing, EPA is providing a comprehensive list of acceptable
substitutes for HCFC-22, HCFC-142b, and blends thereof, generally those
that have been previously found acceptable as substitutes, as well as
HFO-1234ze in several additional end uses. This notice only addresses
the refrigeration and air-conditioning, foam blowing, aerosols, and
sterilants sectors. Because HCFC-22, HCFC-142b, and blends thereof have
not traditionally been used to any significant extent in the fire
suppression and explosion protection, solvent cleaning, tobacco
expansion, and adhesives, coatings and inks sectors, we are not making
listing decisions for substitutes in these sectors in this notice.

B. What happened during the most recent milestone in the HCFC phaseout?

    Under the Montreal Protocol on Substances that Deplete the Ozone
Layer (Montreal Protocol) and the CAA, HCFCs are considered
transitional alternatives in the phaseout of CFCs and other class I
ODS. HCFCs are less potent ozone depleters than are CFCs and other
class I substances; however, they are still subject to both a global
and domestic phaseout under the Montreal Protocol and the CAA. HCFCs
will no longer be produced in or imported into the United States in
accordance with a tiered phaseout that will culminate in the United
States in 2030. Under CAA Section 610, the sale and distribution of, or
offer for sale and distribution of certain uses of HCFCs in foam
blowing and in aerosols or other pressurized dispensers is prohibited.
Further, under CAA Section 605(a) and EPA's implementing regulations,
use and introduction into interstate commerce (including sale of HCFCs)
is or will be prohibited according to the schedule available in the
rules cited below and at 40 CFR 82.16, with exceptions for: (1) HCFCs
that have been used, recovered, and recycled; (2) HCFCs completely used
up in a reaction to create other chemicals; and (3) HCFCs used in
refrigeration equipment manufactured before specified dates.
    In a December 10, 1993, rule (58 FR 65018), EPA established a
`worst-first' approach for the HCFC phaseout; thus the HCFCs with
higher ODPs were scheduled for phaseout earlier than those with lower
ODPs. That rule announced an accelerated schedule for the phaseout of
HCFC-22 and HCFC-142b, such that the production and import of HCFC-22
and HCFC-142b for use in new equipment would be banned as of January 1,
2010. Since 2003 (68 FR 2819), producers or importers of HCFC-22 and
HCFC-142b have been required to hold allowances and importers of used
HCFCs have been required to obtain prior approval of import on a per
shipment basis. In a December 15, 2009, rule (74 FR 66412), EPA reduced
the number of HCFC-22 and HCFC-142b allowances to meet and exceed the
2010 reduction step under the Montreal Protocol. That rule also
clarified the use ban described in the 1993 rule and generally limited
virgin HCFC-22 and HCFC-142b to use as refrigerants in the servicing of
existing equipment. It established an exception for the use of HCFC-22
as a refrigerant in newly manufactured equipment where the components
were manufactured prior to January 1, 2010, and are specified in a pre-
2010 building permit or contract for use on a particular project, as
well as temporary exceptions for the use of HCFC-22 in medical
equipment and thermostatic expansion valves. For additional information
on the HCFC phaseout, please see the rules promulgated on December 10,
1993 (58 FR 65018), January 21, 2003 (68 FR 2819), and December 15,
2009 (74 FR 66412).

C. How does today's SNAP listing affect alternatives to HCFCs other
than HCFC-22, HCFC-142b, and blends thereof?

    This notice does not affect previous SNAP listings of acceptable
alternatives to HCFC-141b, which was phased out of production in 2003,
nor does it list alternatives to the remainder of HCFCs, such as HCFC-
123, HCFC-124, HCFC-225ca, and HCFC-225cb, which will be phased out on
a later schedule. EPA anticipates updating the lists of acceptable
substitutes under SNAP before the production phaseout of other HCFCs.
    We note that EPA recently received a petition concerning the
listing of HFC-134a in various end uses.\4\ We are still reviewing that
petition and nothing in this notice should be construed as prejudging
EPA's response to that petition.
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    \4\ The petition is available at http://www.regulations.gov as
item EPA-HQ-OAR-2003-0118-0249.
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D. In servicing existing refrigeration or air-conditioning equipment,
may I continue to use refrigerants, previously found acceptable by
SNAP, that contain HCFC-22, HCFC-142b, and blends thereof?

    HCFC-22, as well as some refrigerant blends containing HCFC-22 and/
or HCFC-142b, have previously been found acceptable under SNAP for
specified end uses. As noted above, these refrigerant blends, which
appear in Table 1, below, may continue to be used in servicing existing
equipment, i.e., equipment manufactured before January 1, 2010, in
those end uses per the regulations at 40 CFR 82.15(g)(2)(i). (EPA
defines the term ``manufactured'' for appliances at 40 CFR 82.3.)

   Table 1--Summary of Refrigerants Containing HCFC-22, HCFC-142b, and
       Blends Thereof Previously Determined Acceptable Under SNAP
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                                              Further identification
                                              information for blend
           Refrigerant blend                  (alternative names and
                                                   composition)
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Freeze 12..............................  R-134a/142b.
FreeZone...............................  HCFC Blend Delta; RB-276; R-
                                          134a/142b/lubricant.

GHG-HP.................................  HCFC Blend Lambda; R-22/600a/
                                          142b.
GHG-X5.................................  Autofrost X5; R-22/227ea/600a/
                                          142b.
Greencool (Gu) or China Sun G2018C.....  R-1270/22/152a.
ICOR...................................  R-22/142b.
NARM-502...............................  HCFC Blend Iota; R-23/22/152a.
PFC-330ST, PFC-550HC, PFC-660HC, PFC-    Compositions are Confidential
 1100HC, PFC-1100LT, PGC-100, PGC-150.    Business Information (CBI).
R-401A.................................  SUVA MP 39; R-22/152a/124 (53.0/
                                          13.0/34.0).
R-401B.................................  SUVA MP 66; R-22/152a/124 (61.0/
                                          11.0/28.0).
R-401C.................................  SUVA MP 52; R-22/152a/124 (33.0/
                                          15.0/52.0).
R-402A.................................  SUVA HP80; R-125/290/22 (60.0/
                                          2.0/38.0).
R-402B.................................  SUVA HP81; R-125/290/22 (38.0/
                                          2.0/60.0).
R-403B.................................  ISCEON 69-L; R-290/22/218 (5.0/
                                          56.0/39.0).
R-406A.................................  GHG-12; GHG-X3; McMullen Oil
                                          McCool; Monroe Air Tech
                                          Autofrost-X3; R-22/600a/142b
                                          (55.0/4.0/41.0).
R-408A.................................  HCFC Blend Epsilon; FX-10; R-
                                          125/143a/22 (7.0/46.0/47.0).
R-409A.................................  HCFC Blend Gamma; FX-56; R-22/
                                          124/142b (60.0/25.0/15.0).
R-411A.................................  Greencool (Gu) or China Sun
                                          G2018A; R-1270/22/152a (1.5/
                                          87.5/11.0).
R-411B.................................  Greencool (Gu) or China Sun
                                          G2018B; R-1270/22/152a (3.0/
                                          94.0/3.0).
R-414A.................................  HCFC Blend Xi; GHG-X4; McMullen
                                          Oil Chill-It; McCool Chill-It;
                                          Monroe Air Tech Autofrost-X4;
                                          R-22/124/600a/142b (51.0/28.5/
                                          4.0/16.5).
R-414B.................................  HCFC Blend Omicron; Hot Shot;
                                          Kar Kool; R-22/124/600a/142b
                                          (50.0/39.0/1.5/9.5).
R-420A.................................  Choice R-420A; R-134a/142b
                                          (88.0/12.0).
THR-04.................................  Composition is CBI.
------------------------------------------------------------------------

    While HCFC-22 and blends containing HCFC-22 and/or HCFC-142b may
currently continue to be used to service existing refrigeration and
air-conditioning equipment, EPA reiterates that HCFCs and HCFC blends
are not long-term substitutes for ODS. EPA is considering whether
current or potential substitutes are available that pose lower risk
than these blends.

IV. What are my existing and new options for alternative refrigerants?

    In the refrigeration and air-conditioning sector, EPA has
previously found acceptable HCFC-22 and HCFC blends, including those
containing HCFC-22 and HCFC-142b. To aid end users in the refrigeration
and air-conditioning sector as they transition from use of these
refrigerants, this section lists, by end use: (1) Refrigerants that EPA
previously found acceptable as substitutes for HCFC-22 and HCFC blends,
including those containing HCFC-22 and/or HCFC-142b; and (2)
refrigerants that EPA is newly finding acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b. Where possible,
refrigerants listed as acceptable in the refrigeration and air-
conditioning section are identified by their designation per American
Society of Heating, Refrigerating and Air-Conditioning Engineers
(ASHRAE) Standard 34.
    At the end of the decision for each end use, there is narrative
comparing environmental, flammability, and toxicity information of the
newly acceptable alternatives with other currently or potentially
available alternatives. Flammable refrigerants are hazardous waste and
must be disposed of consistent with regulations under the Resource
Conservation and Recovery Act (RCRA). More environmental and health
information is also available in the original SNAP rule of March 18,
1994, the notice of acceptability in which each substitute was first
listed, or the sector table, which provides identification information,
environmental information, flammability information, and toxicity and
exposure data for each of the acceptable alternatives to HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b, in the refrigeration and
air-conditioning sector. The sector table is available at http://
www.epa.gov/ozone/snap/refrigerants/index.html.

A. Household and Light Commercial Air-Conditioning and Heat Pumps

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in household and light commercial air-conditioning and heat
pumps:
     R-404A (new and retrofit equipment)
     R-407A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in household and
light commercial air-conditioning and heat pumps:
     Ammonia absorption system (new equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HFC-134a (new equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) \5\ (new and retrofit equipment)
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    \5\ Throughout the decisions, available trade names for
refrigerants without ASHRAE designations are provided in
parentheses.
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     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)

     R-424A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-437A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
    Comparison to other refrigerants in the household and light
commercial air-conditioning and heat pumps end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section A.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have 100-year
integrated (100-yr) global warming potentials (GWPs) \6\ relative to
CO2 ranging from 0 to about 3390, comparable to or lower
than that of other substitutes for HCFC-22 and blends containing HCFC-
22 and/or HCFC-142b. For example, the GWP of R-404A is about 3920, the
GWP of R-407A is about 2110, the GWP of R-407C is about 1770, the GWP
of R-410A is about 2090, and the GWP of R-507A is about 3990. The
contribution of these refrigerants to greenhouse gas emissions is
limited given the venting prohibition under section 608(c)(2) of the
CAA and EPA's implementing regulations codified at 40 CFR 82.154(a)(1),
which limit emissions of refrigerant substitutes.
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    \6\ These values are based upon mass-weighted averages of the
component chemicals, using the 100-yr GWPs listed in the
International Panel on Climate Change's [IPCC] Fourth Assessment
Report, Climate Change 2007: The Physical Science Basis. Another
available source for GWPs is the IPCC's Second Assessment Report,
Climate Change 1995: Working Group I--The Science of Climate Change,
accessible from http://www.ipcc.ch/ipccreports/sar/wg_I/ipcc_sar_
wg_I_full_report.pdf.
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    None of the newly listed refrigerant substitutes contain any
components that are defined as hazardous air pollutants (HAPs) under
the CAA. Some of the newly listed substitutes contain small amounts of
components that are considered volatile organic compounds (VOCs) under
CAA regulations (see 40 CFR 51.100(s)) addressing the development of
state implementation plans (SIPs) to attain and maintain the national
ambient air quality standards. None of the substitutes previously found
acceptable in IV.A.1, above, contain VOCs. However, emissions of VOCs
from refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.\7\
---------------------------------------------------------------------------

    \7\ EPA 1994. Significant New Alternatives Policy Technical
Background Document: Risk Screen on the Use of Substitutes for Class
I Ozone-depleting Substances: Refrigeration and Air Conditioning.
---------------------------------------------------------------------------

    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that flammability risks posed by ammonia can be
addressed by existing standards from the Occupational Safety and Health
Administration (OSHA) and ASHRAE and other safety precautions common in
the refrigeration and air-conditioning industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8-hours, such as Workplace Environmental
Exposure Limits (WEELs) from the American Industrial Hygiene
Association (AIHA) or Threshold Limit Values (TLVs) from the American
Conference of Government Industrial Hygienists (ACGIH). Ammonia has a
Permissible Exposure Limit (PEL) of 50 ppm over 8 hours from OSHA. EPA
anticipates that users will be able to meet the workplace exposure
limits (WEELs, TLVs, and PELs) and will address potential health risks
by following requirements and recommendations in the Material Safety
Data Sheets (MSDSs) and other safety precautions common in the
refrigeration and air-conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.A.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
household and light commercial air-conditioning and heat pumps end use.

B. Residential Dehumidifiers

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in residential dehumidifiers:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in residential
dehumidifiers:
     HFC-134a (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5%by weight) (ICOR
AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-437A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
    Comparison to other refrigerants in the residential dehumidifiers
end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section B.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.B.1, above, contain VOCs. However, emissions of VOCs

from refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.B.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
residential dehumidifiers end use.

C. Reciprocating and Screw Chillers

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in reciprocating and screw chillers:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in reciprocating
and screw chillers:
     Ammonia absorption chillers or vapor compression with
secondary loop (new equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HFC-134a (new and retrofit equipment)
     HFC-227ea (new equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the reciprocating and screw
chillers end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section C.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.C.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.C.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
reciprocating and screw chillers end use.

D. Centrifugal Chillers

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in centrifugal chillers:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in centrifugal
chillers:
     Ammonia absorption chillers or vapor compression with
secondary loop (new equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HFC-134a (new and retrofit equipment)
     HFC-227ea (new equipment)
     HFC-245fa (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)

     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-423A (ISCEON 39TC) (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     Stirling cycle (new equipment)
     Water/lithium bromide (new equipment)
    Comparison to other refrigerants in the centrifugal chillers end
use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section D.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.D.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8-hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. HFC-245fa exhibits moderate to low toxicity and has an 8-hour
WEEL of 300 ppm. Water/lithium bromide absorption exhibits low
toxicity. Lithium bromide (LiBr) has a 24-hour/day, 90 day Continuous
Exposure Guidance Level (CEGL) value of 1 mg/m\3\ from the National
Research Council (NRC). Based on this CEGL, EPA recommends an 8-hour
preliminary workplace exposure limit of 3 mg/m\3\.\8\ EPA anticipates
that users will be able to meet the workplace exposure limits (WEELs,
TLVs, PELs and CEGL) and will address potential health risks by
following requirements and recommendations in the MSDSs and other
safety precautions common in the refrigeration and air-conditioning
industry. Therefore, we find the newly listed substitutes (in IV.D.2,
above) acceptable because they do not pose a greater overall risk to
human health and the environment than the other substitutes available
in the centrifugal chillers end use.
---------------------------------------------------------------------------

    \8\ EPA's analysis of the NRC CEGL and rationale for preliminary
workplace exposure limit are available at http://www.regulations.gov
as item EPA-HQ-OAR-2003-0118-0243 EPA anticipates that lithium
bromide powder will be used consistent with the personal protective
equipment recommendations specified by OSHA (http://www.osha.gov/
pls/oshaweb/owastand.display_standard_group?p_toc_level=1&p_
part_number=1910#1910_Subpart_I).
---------------------------------------------------------------------------

E. Industrial Process Air-Conditioning

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in industrial process air-conditioning:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in industrial
process air-conditioning:
     Ammonia vapor compression or absorption systems (new
equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HFC-134a (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-423A (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
    Comparison to other refrigerants in the industrial process air-
conditioning end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section E.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.

    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.E.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8-hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.E.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
industrial process air-conditioning end use.

F. Industrial Process Refrigeration

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in industrial process refrigeration:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in industrial
process refrigeration:
     Ammonia vapor compression or absorption-systems (new
equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HC Blend A (OZ-12) (new and retrofit equipment)
     HC Blend B (original formulation of HC-12a) (new and
retrofit equipment)
     HFC-134a (new and retrofit equipment)
     HFC-227ea (new equipment)
     HFE-7000 \9\ (new and retrofit equipment)
---------------------------------------------------------------------------

    \9\ 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane; HFE-347mcc3; CAS
ID 375-03-1.
---------------------------------------------------------------------------

     HFE-7100 \10\ and HFE-7200 \11\ as secondary heat transfer
fluid in not-in-kind systems (new equipment)
---------------------------------------------------------------------------

    \10\ Methoxynonafluorobutane, iso and normal; HFE-449s1; CAS ID
163702-07-6.
    \11\ Ethoxynonafluorobutane, iso and normal; HFE-569sf2; CAS ID
163702-05-4.
---------------------------------------------------------------------------

     Nitrogen direct gas expansion (new equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-290 (Propane) (new and retrofit equipment)
     R-407A and R-407B (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-423A (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-428A (new equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     R-600 (Butane) (new and retrofit equipment)
     R-744 (Carbon dioxide, CO2) (new equipment)
     R-1270 (Propylene) (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the industrial process
refrigeration end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section F.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3610, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
The hydrocarbon substitutes that we are finding acceptable are at the
low end of this range. Specifically, R-290, R-600, R-1270, and HC
Blends A and B each have a GWP of about 5 or less. This in contrast
with the GWPs of the previously listed substitutes, including the GWP
of R-404A which is about 3920, the GWP of R-407C which is about 1770,
the GWP of R-410A which is about 2090, the GWP of R-422A which is about
3140, and the GWP of R-507A which is about 3990. The contribution of
these refrigerants to greenhouse gas emissions is limited given the
venting prohibition under section 608(c)(2) of the CAA and EPA's
implementing regulations codified at 40 CFR 82.154(a)(1), which limit
emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. The hydrocarbons R-
290, R-600, and R-1270, as well as all components of HC Blends A and B,
are considered VOCs under CAA regulations (see 40 CFR 51.100(s))
addressing the development of SIPs to attain and maintain the national
ambient air quality standards. Some of the newly listed substitutes
contain small amounts of components that are considered VOCs under
these regulations. In comparison, one of the substitutes previously
found acceptable in IV.F.1, above, (R-422A) contains a VOC component.
Emissions of VOCs from refrigerant blends are expected to be small
relative to the total emissions of VOCs from all sources.
    Ammonia has an ASHRAE class 2 flammability classification or
moderate flammability risk. EPA believes that the moderate flammability
risks of ammonia can be addressed by existing standards from OSHA and
ASHRAE and other safety precautions common in the refrigeration and
air-conditioning industry. Each of the newly listed hydrocarbons and
hydrocarbon blends

has an ASHRAE class 3 flammability classification. As early as the 1994
original SNAP rule, EPA noted that hydrocarbons were used in industrial
process refrigeration, including specialized industrial applications
such as oil refineries and chemical plants. EPA noted that these users
were familiar with hydrocarbons, had safety procedures in place, and
that their facilities were designed to comply with the safety standards
required for managing flammable chemicals.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low when used according
to standard practices for industrial processes and for industrial
process refrigeration. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH.
Ammonia has a PEL of 50 ppm over 8 hours from OSHA. HFE-7200 has an 8-
hour manufacturer acceptable exposure limit (AEL) of 200 ppm and HFE-
7000 has an 8-hour manufacturer AEL of 75 ppm. Within the industrial
process refrigeration end use, such as at chemical or other industrial
plants, proper exposure controls and ventilation are generally
available as well as established protocols for handling potentially
hazardous materials, and therefore overall occupational risk is
mitigated. EPA anticipates that users will be able to meet the
workplace exposure limits (WEELs, TLVs, PELs, and manufacturer AELs)
and will address potential health risks by following requirements and
recommendations in the MSDSs and other safety precautions common in the
refrigeration and air-conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.F.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
industrial process refrigeration end use.

G. Bus and Passenger Train Air-Conditioning

    The bus and passenger train air-conditioning end use previously had
substitutes listed as acceptable for HCFC-22 itself, but not as
substitutes for blends containing HCFC-22 and/or HCFC-142b; this is
reflected in category (1), below.
    1. EPA previously found the following acceptable as substitutes for
HCFC-22 in bus and passenger train air-conditioning:
     HFC-134a (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-417A (new and retrofit equipment)
     R-422B and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in bus and
passenger train air-conditioning:
     Evaporative cooling (new equipment)
     HFC-134a (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-417A (new and retrofit equipment)
     R-422B and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the bus and passenger train
air-conditioning end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section G.1 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3250, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920 and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. However, emissions of VOCs from refrigerant blends
are expected to be small relative to the total emissions of VOCs from
all sources.
    None of the newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b is flammable. The toxicity risks of
the newly listed substitutes for HCFC-22 and blends containing HCFC-22
and/or HCFC-142b are low. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH. For
each of these substitutes, EPA anticipates that users will be able to
meet the workplace exposure limits (WEELs, TLVs, and PELs) and will
address potential health risks by following requirements and
recommendations in the MSDSs and other safety precautions common in the
refrigeration and air-conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.G.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
bus and passenger train air-conditioning end use.

H. Ice Skating Rinks

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in ice skating rinks:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22

and blends containing HCFC-22 and/or HCFC-142b in ice skating rinks:
     Ammonia vapor compression or absorption systems (new
equipment)
     HFC-134a (new and retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-407A and R-407B (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-423A (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-428A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
    Comparison to other refrigerants in the ice skating rinks end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section H.2 are non-ozone
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3610, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-422A is
about 3140. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, one of the substitutes previously
found acceptable in IV.H.1, above, (R-422A) contains a VOC component.
Emissions of VOCs from refrigerant blends are expected to be small
relative to the total emissions of VOCs from all sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry. Therefore, we find the newly listed substitutes
(in IV.H.2, above) acceptable because they do not pose a greater
overall risk to human health and the environment than the other
substitutes available in the ice skating rinks end use.

I. Cold Storage Warehouses

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in cold storage warehouses:
     R-404A (new and retrofit equipment)
     R-407A and R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-428A (new and retrofit equipment)
     R-507A (new and retrofit equipment)
     R-744 (Carbon dioxide, CO2) (new equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in cold storage
warehouses:
     Ammonia vapor compression or absorption systems (new
equipment)
     Desiccant cooling (new equipment)
     Evaporative cooling (new equipment)
     HFC-134a (new and retrofit equipment)
     HFC-227ea (new equipment)
     Pressure stepdown (new equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-407B (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-423A (ISCEON 39TC) (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     Self-chilling cans containing recycled CO2 (not
generating CO2 via chemical reaction) (new and retrofit
equipment)
     SP34E (new and retrofit equipment)
     Stirling cycle
    Comparison to other refrigerants in the cold storage warehouses end
use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section I.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, the GWP of R-422A is about
3140, the GWP of R-428A is about 3610, and the GWP of R-507A is about
3990. The contribution of these refrigerants to greenhouse gas
emissions

is limited given the venting prohibition under section 608(c)(2) of the
CAA and EPA's implementing regulations codified at 40 CFR 82.154(a)(1),
which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, two of the substitutes previously
found acceptable in IV.I.1, above, (R-422A and R-428A) contain some VOC
components. However, emissions of VOCs from refrigerant blends are
expected to be small relative to the total emissions of VOCs from all
sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. For each of these substitutes, EPA anticipates that users will be
able to meet the workplace exposure limits (WEELs, TLVs, and PELs) and
will address potential health risks by following requirements and
recommendations in the MSDSs and other safety precautions common in the
refrigeration and air-conditioning industry. Therefore, we find the
newly listed substitutes (in IV.I.2, above) acceptable because they do
not pose a greater overall risk to human health and the environment
than the other substitutes available in the cold storage warehouse end
use.

J. Refrigerated Transport

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in refrigerated transport:
     R-404A (new and retrofit equipment)
     R-407A and R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-428A (new and retrofit equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in refrigerated
transport:
     Cryogenic system using recaptured liquid CO2 or
liquid nitrogen (new equipment)
     Direct nitrogen expansion (new equipment)
     HFC-134a (new and retrofit equipment)
     R-125/134a/600a (28.1%/70.0%/1.9% by weight) (new and
retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-407B and R-407D (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the refrigerated transport end
use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section J.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407A is
about 2110, the GWP of R-407C is about 1770, the GWP of R-410A is about
2090, the GWP of R-428A is about 3610, and the GWP of R-507A is about
3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, one of the substitutes previously
found acceptable in IV.J.1, above, (R-428A) contains some VOC
components. However, emissions of VOCs from refrigerant blends are
expected to be small relative to the total emissions of VOCs from all
sources.
    None of the newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b is flammable. The toxicity risks of
the newly listed substitutes for HCFC-22 and blends containing HCFC-22
and/or HCFC-142b are low. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH. For
each of these substitutes, EPA anticipates that users will be able to
meet the workplace exposure limits (WEELs, TLVs, and PELs) and will
address potential health risks by following requirements and
recommendations in the MSDSs and other safety precautions common in the
refrigeration and air-conditioning industry. Therefore, we find the
newly listed substitutes (in IV.J.2, above) acceptable because they do
not pose a greater overall risk to human health and the environment
than the other substitutes available in the refrigerated transport end
use.

K. Retail Food Refrigeration

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in retail food refrigeration:
     R-404A (new and retrofit equipment)
     R-407A (new and retrofit equipment)
     R-407C (new and retrofit equipment)

     R-410A (new equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-428A (new and retrofit equipment)
     R-507A (new and retrofit equipment)
     R-744 (Carbon dioxide, CO2) (new equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in retail food
refrigeration:
     Ammonia vapor compression with a secondary loop (new
equipment)
     HFC-134a (new and retrofit equipment)
     HFE-7100 and HFE-7200 as secondary heat transfer fluid in
not-in-kind systems (new equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-407B (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
    Comparison to other refrigerants in the retail food refrigeration
end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section K.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, the GWP of R-422A is about
3140, the GWP of R-428A is about 3610, and the GWP of R-507A is about
3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, two of the substitutes previously
found acceptable in IV.K.1, above, (R-422A and R-428A) contain some VOC
components. However, emissions of VOCs from refrigerant blends are
expected to be small relative to the total emissions of VOCs from all
sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. HFE-7200 has an 8-hour manufacturer AEL of 200 ppm. For each of
these substitutes, EPA anticipates that users will be able to meet the
workplace exposure limits (WEELs, TLVs, PELs, and manufacturer AEL) and
will address potential health risks by following requirements and
recommendations in the MSDSs and other safety precautions common in the
refrigeration and air-conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.K.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
retail food refrigeration end use.

L. Commercial Ice Machines

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in commercial ice machines:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-428A (new and retrofit equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in commercial
ice machines:
     Ammonia vapor compression or absorption-systems (new
equipment)
     HFC-134a (new equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-407A and R-407B (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the commercial ice machines end
use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section L.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, the GWP of R-428A is about
3610, and the GWP of R-507A is about 3990. The contribution of these

refrigerants to greenhouse gas emissions is limited given the venting
prohibition under section 608(c)(2) of the CAA and EPA's implementing
regulations codified at 40 CFR 82.154(a)(1), which limit emissions of
refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, one of the substitutes previously
found acceptable in IV.L.1, above, (R-428A) contains some VOC
components. However, emissions of VOCs from refrigerant blends are
expected to be small relative to the total emissions of VOCs from all
sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.L.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
commercial ice machines end use.

M. Household Refrigerators and Freezers

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in household refrigerators and freezers:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-422A (ISCEON 79) (new and retrofit equipment)
     R-428A (new and retrofit equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in household
refrigerators and freezers:
     Ammonia absorption systems (new equipment)
     HFC-134a (new and retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-424A (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-427A (retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     RS-44 (2003 formulation) (new and retrofit equipment)
    Comparison to other refrigerants in the household refrigerators and
freezers end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section M.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, the GWP of R-422A is about
3140, the GWP of R-428A is about 3610, and the GWP of R-507A is about
3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. In comparison, two of the substitutes previously
found acceptable in IV.M.1, above, (R-422A and R-428A) contain some VOC
components. However, emissions of VOCs from refrigerant blends are
expected to be small relative to the total emissions of VOCs from all
sources.
    With the exception of ammonia, none of the newly listed substitutes
for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b is
flammable. EPA believes that the flammability risks posed by ammonia
can be addressed by existing standards from OSHA and ASHRAE and other
safety precautions common in the refrigeration and air-conditioning
industry.
    The toxicity risks of the newly listed substitutes for HCFC-22 and
blends containing HCFC-22 and/or HCFC-142b are low. Most of the blends
contain HFC or hydrocarbon components with workplace exposure limits of
500 to 1,000 ppm averaged over 8 hours, such as WEELs from the AIHA or
TLVs from the ACGIH. Ammonia has a PEL of 50 ppm over 8 hours from
OSHA. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, and PELs) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.M.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
household refrigerators and freezers end use.

N. Vending Machines

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in vending machines:
     R-404A (new and retrofit equipment)

     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in vending
machines:
     HFC-134a (new and retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
     Stirling cycle (new equipment)
    Comparison to other refrigerants in the vending machines end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section N.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.N.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    None of the newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b is flammable. The toxicity risks of
the newly listed substitutes for HCFC-22 and blends containing HCFC-22
and/or HCFC-142b are low. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH. EPA
anticipates that users will be able to meet the workplace exposure
limits (WEELs, TLVs, and PELs) and will address potential health risks
by following requirements and recommendations in the MSDSs and other
safety precautions common in the refrigeration and air-conditioning
industry.
    Therefore, we find the newly listed substitutes (in IV.N.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
vending machines end use.

O. Water Coolers

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in water coolers:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
     R-507A (new and retrofit equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in water
coolers:
     HFC-134a (new and retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-410B (new equipment)
     R-417A (new and retrofit equipment)
     R-421A and R-421B (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-426A (new and retrofit equipment)
     R-434A (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     RS-24 (2002 formulation) (new and retrofit equipment)
     SP34E (new and retrofit equipment)
    Comparison to other refrigerants in the water coolers end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section O.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, the GWP of R-410A is about 2090, and the GWP of R-507A is
about 3990. The contribution of these refrigerants to greenhouse gas
emissions is limited given the venting prohibition under section
608(c)(2) of the CAA and EPA's implementing regulations codified at 40
CFR 82.154(a)(1), which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.O.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    None of the newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b is flammable. The toxicity risks of
the newly listed substitutes for HCFC-22 and blends containing HCFC-22
and/or HCFC-142b are low. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH. EPA
anticipates that users will be able to meet the workplace exposure
limits (WEELs, TLVs, and PELs) and will address potential health risks
by following requirements and recommendations in the MSDSs and other
safety precautions common in the refrigeration and air-conditioning
industry.

    Therefore, we find the newly listed substitutes (in IV.O.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
vending machines end use.

P. Very Low Temperature Refrigeration

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in very low temperature refrigeration:
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in very low
temperature refrigeration:
     HFE-7100 and HFE-7200 as secondary heat transfer fluid in
not-in-kind systems (new equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-422B and R-422C (new and retrofit equipment)
     R-744 (Carbon dioxide, CO2) (new equipment)
    Comparison to other refrigerants in the very low temperature
refrigeration end use:
    The newly listed substitutes for HCFC-22 and blends containing
HCFC-22 and/or HCFC-142b listed above in section P.2 are non-ozone-
depleting, in contrast to HCFC-22 or blends containing HCFC-22 and/or
HCFC-142b. They are comparable to other acceptable substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in their lack of
risk for ozone depletion. The newly listed substitutes have GWPs
ranging from 0 to about 3390, comparable to or lower than that of other
substitutes for HCFC-22 and blends containing HCFC-22 and/or HCFC-142b.
For example, the GWP of R-404A is about 3920, the GWP of R-407C is
about 1770, and the GWP of R-410A is about 2090. The contribution of
these refrigerants to greenhouse gas emissions is limited given the
venting prohibition under section 608(c)(2) of the CAA and EPA's
implementing regulations codified at 40 CFR 82.154(a)(1), which limit
emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. Some of the newly
listed substitutes contain small amounts of components that are
considered VOCs under CAA regulations (see 40 CFR 51.100(s)) addressing
the development of SIPs to attain and maintain the national ambient air
quality standards. None of the substitutes previously found acceptable
in IV.P.1, above, contain VOCs. However, emissions of VOCs from
refrigerant blends are expected to be small relative to the total
emissions of VOCs from all sources.
    None of the newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b is flammable. The toxicity risks of
the newly listed substitutes for HCFC-22 and blends containing HCFC-22
and/or HCFC-142b are low. Most of the blends contain HFC or hydrocarbon
components with workplace exposure limits of 500 to 1,000 ppm averaged
over 8 hours, such as WEELs from the AIHA or TLVs from the ACGIH. HFE-
7200 has an 8-hour manufacturer AEL of 200 ppm. R-744 has a PEL of 5000
ppm. EPA anticipates that users will be able to meet the workplace
exposure limits (WEELs, TLVs, PELs and AEL) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry.
    Therefore, we find the newly listed substitutes (in IV.P.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
vending machines end use.

Q. Non-Mechanical Heat Transfer Systems

    HFO-1234ze,\12\ which was previously listed as a substitute for
class I and class II ODS in several foam blowing end uses (September
30, 2009; 74 FR 50129) is today being listed as acceptable as a
substitute for CFC-113, HCFC-22, and blends containing HCFC-22 and/or
HCFC-142b, in the heat transfer end use. You may find the submission
under Docket items EPA-HQ-OAR-2003-0118-0222 and EPA-HQ-OAR-2003-0118-
0247 at http://www.regulations.gov. We note that EPA is also reviewing
this substance through a Pre-Manufacture Notice (PMN) under the Toxic
Substances Control Act (TSCA) and users will be subject under TSCA to
any requirements established through the PMN process.
---------------------------------------------------------------------------

    \12\ HFC-1234ze; HFO-1234ze(E); HFC-1234ze(E); trans-1,3,3-
tetrafluoroprop-1-ene; CAS ID 29118-24-9.
---------------------------------------------------------------------------

    1. EPA previously found the following acceptable as substitutes for
HCFC-22 and HCFC blends, including those containing HCFC-22 and/or
HCFC-142b, in non-mechanical heat transfer systems:
     HFC-4310mee (new and retrofit equipment)
     R-404A (new and retrofit equipment)
     R-407C (new and retrofit equipment)
     R-410A (new equipment)
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22 and blends containing HCFC-22 and/or HCFC-142b in non-
mechanical heat transfer systems:
     C6-perfluoroketone \13\ (Novec\TM\ 649) (new and retrofit
equipment)
---------------------------------------------------------------------------

    \13\ 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-
pentanone or FK-5-1-12mmy2; CAS ID 756-13-8.
---------------------------------------------------------------------------

     HFC-245fa (new and retrofit equipment)
     HFE-7000 (new and retrofit equipment)
     HFE-7100 (new and retrofit equipment)
     HFE-7200 (new and retrofit equipment)
     HFO-1234ze (new and retrofit equipment)
     R-125/290/134a/600a (55.0%/1.0%/42.5%/1.5% by weight)
(ICOR AT-22) (new and retrofit equipment)
     R-417A (new and retrofit equipment)
     R-422B, R-422C, and R-422D (new and retrofit equipment)
     R-438A (new and retrofit equipment)
     R-744 (Carbon Dioxide, CO2) (new and retrofit
equipment)
     Volatile Methyl Siloxanes \14\ (new and retrofit
equipment)
---------------------------------------------------------------------------

    \14\ Octamethylcyclo-tetrasiloxanes (e.g., D4, CAS ID
556-67-2) and decamethylcyclo-pentasiloxanes (e.g., D5, CAS
ID 541-02-6).
---------------------------------------------------------------------------

     Water (new and retrofit equipment)
    3. EPA is newly finding the following acceptable as a substitute
for CFC-113 in non-mechanical heat transfer systems:
     HFO-1234ze (new and retrofit equipment)
    Comparison to other refrigerants in the non-mechanical heat
transfer systems end use:
    The newly listed substitutes for CFC-113, HCFC-22, and blends
containing HCFC-22 and/or HCFC-142b listed above in section P.2 and 3
are non-ozone-depleting, in contrast to CFC-113, HCFC-22, or blends
containing HCFC-22 and/or HCFC-142b. They are comparable to other
acceptable substitutes for CFC-113, HCFC-22, and blends containing
HCFC-22 and/or HCFC-142b in their lack of risk for ozone depletion.
HFO-1234ze has no

ODP. HFO-1234ze has a GWP of 6 and an atmospheric lifetime of
approximately 2 weeks (Javadi et al., 2008). The newly listed
substitutes have GWPs ranging from 0 to about 3390, comparable to or
lower than that of other substitutes for CFC-113, HCFC-22, and blends
containing HCFC-22 and/or HCFC-142b. For example, the GWP of HFC-
4310mee is about 1640, the GWP of R-404A is about 3920, the GWP of R-
407C is about 1770, and the GWP of R-410A is about 2090. The
contribution of these refrigerants to greenhouse gas emissions is
limited given the venting prohibition under section 608(c)(2) of the
CAA and EPA's implementing regulations codified at 40 CFR 82.154(a)(1),
which limit emissions of refrigerant substitutes.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. C6-perfluoroketone
and HFO-1234ze are considered VOCs under CAA regulations (see 40 CFR
51.100(s)) addressing the development of SIPs to attain and maintain
the national ambient air quality standards. Some of the newly listed
substitutes contain small amounts of components that are considered
VOCs under those regulations. In comparison, none of the substitutes
previously found acceptable in IV.Q.1, above, contain VOCs. EPA has
received a petition to exempt HFO-1234ze from the definition of VOC for
purposes of SIPs to attain and maintain the NAAQS on the basis that the
chemical has a low photochemical reactivity. EPA intends to address the
request through notice-and-comment rulemaking. Further, emissions of
VOCs from refrigerant blends are expected to be small relative to the
total emissions of VOCs from all sources.
    With the exception of some of the volatile methyl siloxanes, none
of the newly listed substitutes for CFC-113, HCFC-22, and blends
containing HCFC-22 and/or HCFC-142b is flammable. Some volatile methyl
siloxanes have flammability risks, and EPA believes that these will be
addressed by existing standards from OSHA, ASHRAE, guidelines in the
MSDSs, and other safety precautions common in the refrigeration and
air-conditioning industry.
    The toxicity risks of the newly listed substitutes for CFC-113,
HCFC-22, and blends containing HCFC-22 and/or HCFC-142b are low. The
potential health effects of HFO-1234ze at lower concentrations include
drowsiness and dizziness. At sufficiently high concentrations, it may
cause central nervous system depression or irregular heartbeat. HFO-
1234ze could cause asphyxiation, if air is displaced by vapor in a
confined space. The substitute may also irritate the lungs, skin or
eyes or cause frostbite. These potential health effects are common to
many refrigerants. EPA anticipates that users of non-mechanical heat
transfer systems will take action consistent with the recommendations
specified in the manufacturers' MSDSs for HFO-1234ze. EPA recommends a
workplace AEL of 1,000 ppm on an 8-hour time-weighted average for HFO-
1234ze.\15\ EPA recommends a preliminary consumer exposure limit
(acute) of 10,000 ppm on a 30-minute time-weighted average. Our risk
screen found that workplace and consumer exposure, respectively, are
likely to be well below these levels.\16\
---------------------------------------------------------------------------

    \15\ Due to additional data on toxicity, EPA is able to use a
lower uncertainty factor and recommend a higher workplace AEL
compared to the preliminary AEL analysis (where an AEL of 375 ppm
was recommended).
    \16\ The risk screen as well as derivations of EPA's recommended
workplace AEL and preliminary consumer exposure limit (acute) are
available at http://www.regulations.gov as item EPA-HQ-OAR-2003-
0118-0250.
---------------------------------------------------------------------------

    As for the other newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b, most of the blends contain HFC or
hydrocarbon components with workplace exposure limits of 500 to 1,000
ppm averaged over 8 hours, such as WEELs from the AIHA or TLVs from the
ACGIH. C6-perfluoroketone has an 8-hour manufacturer AEL of 150 ppm,
HFE-7200 has an 8-hour manufacturer AEL of 200 ppm, and HFE-7000 has an
8-hour manufacturer AEL of 75 ppm. EPA anticipates that users will be
able to meet the workplace exposure limits (WEELs, TLVs, PELs,
manufacturer AELs and EPA recommendation) and will address potential
health risks by following requirements and recommendations in the MSDSs
and other safety precautions common in the refrigeration and air-
conditioning industry. Therefore, we find the newly listed substitutes
(in IV.P.2 and 3, above) acceptable because they do not pose a greater
overall risk to human health and the environment than the other
substitutes available in the non-mechanical heat transfer end use.

V. What are my existing and new options for alternative foam blowing
agents?

    Historically, HCFC-22 and HCFC-142b, along with HCFC-141b, have
been used as substitutes for CFC-11 and CFC-12 in foam blowing. HCFC-22
and HCFC-142b were originally found acceptable as substitutes for CFCs
in all foam blowing end uses under the SNAP program (March 18, 1994; 59
FR 13084). In 2007, EPA found a number of foam blowing agents
containing HCFCs unacceptable for use as substitutes for ODS, because
alternatives exist with zero or lower ODPs. Specifically, EPA has found
HCFC-22, HCFC-142b, and blends thereof unacceptable as substitutes for
CFCs in the following end uses:
    [cir] Rigid polyurethane and polyisocyanurate laminated boardstock;
    [cir] Rigid polyurethane appliance;
    [cir] Rigid polyurethane spray and commercial refrigeration, and
sandwich panels;
    [cir] Rigid polyurethane slabstock and other foams;
    [cir] Polystyrene extruded insulation boardstock and billet;
    [cir] Phenolic insulation board and bunstock;
    [cir] Flexible polyurethane; and
    [cir] Polystyrene extruded sheet
    (40 CFR part 82 appendix Q to subpart G)
    EPA has also found HCFC-22, HCFC-142b, and blends thereof
unacceptable as substitutes for HCFC-141b in the following end uses:
    [cir] Rigid polyurethane and polyisocyanurate laminated boardstock;
    [cir] Rigid polyurethane appliance;
    [cir] Rigid polyurethane spray and commercial refrigeration, and
sandwich panels; and
    [cir] Rigid polyurethane slabstock and other foams
    (40 CFR part 82 appendix K to subpart G and 40 CFR part 82 appendix
Q to subpart G)
    Existing users of HCFC-22, HCFC-142b, and blends thereof, as of
November 4, 2005, were allowed a transition period (which varied in
time by end use and application) to switch to alternatives, depending
on the specific use. The last of these transition periods ended January
1, 2010 (40 CFR part 82 appendix Q to subpart G).Corvette2008
    Finally, EPA has found that HCFC-124 is unacceptable as a
substitute for HCFC-123, HCFC-141b, HCFC-142b, HCFC-22, or blends
thereof in all foam blowing end uses (40 CFR Part 82 Appendix K to
Subpart G).
    In the original SNAP rulemaking EPA addressed the use of blends in
foam blowing applications. EPA determined that notification was not
required for ``use of blends or mixtures of substitutes listed as
acceptable under the SNAP program in open-celled or closed-cell or
semi-rigid end uses'' but was required in the following end-uses:
polyurethane and polyisocyanurate rigid laminated boardstock;
polyurethane spray foam; polystyrene extruded boardstock and billet
foams; phenolic foams; and polyolefin foams (59 FR 13084, March

18, 1994). Therefore, blends of acceptable substitutes are also
acceptable substitutes for the following foam blowing end uses: rigid
polyurethane, appliance; rigid polyurethane, commercial (including
commercial foam and sandwich panels, but excluding spray foam); rigid
polyurethane, slabstock; flexible polyurethane; polystyrene, extruded
sheet; and integral skin polyurethane.
    To aid end users as they transition from use of HCFC-22 and HCFC-
142b, sections IV.A through K list, by end use: (1) Foam blowing agents
that EPA previously found acceptable as substitutes for HCFC-22, HCFC-
142b, or all HCFCs; and (2) foam blowing agents that EPA is newly
finding acceptable as substitutes for HCFC-22, HCFC-142b, or blends
thereof. At the end of the decision for each end use, there is
narrative comparing environmental, flammability, and toxicity
information of the newly acceptable alternatives with other currently
or potentially available alternatives. Flammable blowing agents are
hazardous waste when disposed and must be disposed of consistent with
regulations under RCRA. More environmental information, flammability
information, and toxicity and exposure data is also available in the
original SNAP rule of March 18, 1994, the notice of acceptability in
which each substitute was first listed, or the sector table for each of
the acceptable alternatives to HCFC-22, HCFC-142b, and blends thereof,
in the foam blowing sector. The sector table is available at http://
www.epa.gov/ozone/snap/foams/index.html. The sector table also includes
further identification information (including composition and trade
names) for each substitute.
    Due to the unique flammability concerns that affect listings in the
spray foam application, for greater clarity this document separates
listings for spray foam (section V.D) from listings for commercial
refrigeration foam and sandwich panels (section V.C). Commercial
refrigeration foam, spray foam, and sandwich panels together constitute
the rigid polyurethane commercial refrigeration foam, spray foam, and
sandwich panels end use. However, because of the heightened risk of
using a flammable blowing agent when blowing spray foam, in most cases
we have not listed flammable substitutes as acceptable in spray foam
(e.g., methyl formate and C3-C6 saturated light hydrocarbons), although
we have found some acceptable for use in commercial refrigeration foam
and in sandwich panels (see April 11, 2000; 65 FR 19327, December 18,
2000; 65 FR 78977, August 21, 2003; 68 FR 50533, and September 30,
2009; 74 FR 50129). In limited circumstances, where the submitter of a
specific substitute has supplied EPA with a safety training program for
customers to address the flammability risks unique to spray foam, we
have listed such flammable blowing agents as acceptable for spray foam
applications (see December 6, 1999; 64 FR 68039 and October 1, 2004; 69
FR 58903).

A. Rigid Polyurethane & Polyisocyanurate Laminated Boardstock

    HFO-1234ze,\17\ which was previously listed as a substitute for
class I and class II ODS in several foam blowing end uses (September
30, 2009; 74 FR 50129) is today being listed as a substitute for HCFC-
22, HCFC-142b, and blends thereof in five other foam blowing end uses.
You may find the submission under Docket items EPA-HQ-OAR-2003-0118-
0222 and EPA-HQ-OAR-2003-0118-0246 at http://www.regulations.gov.
---------------------------------------------------------------------------

    \17\ HFO-1234ze(E); HFC-1234ze(E); trans-1,3,3-tetrafluoroprop-
1-ene; CAS ID 29118-24-9.
---------------------------------------------------------------------------

    1. EPA previously found the following acceptable as substitutes for
HCFC-22, HCFC-142b, blends thereof, or for all HCFCs in rigid
polyurethane & polyisocyanurate laminated boardstock:
     Carbon dioxide, CO2
     2-chloropropane
     EcomateTM
     Formacel[supreg] TI
     Formic acid
     HFC-134a
     HFC-152a
     HFC-245fa
     Methyl formate
     TranscendTM Technologies, as an additive to
SNAP-approved blowing agents in blends making up to 5% by weight of the
total foam formulation.
     Water
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22, HCFC-142b, and blends thereof in rigid polyurethane &
polyisocyanurate laminated boardstock:
     Electroset technology
     Exxsol blowing agents
     HFC-365mfc
     HFO-1234ze
     Saturated light hydrocarbons C3-C6 (e.g., propane, butane,
isobutane, pentane, cyclopentane, hexane, cyclohexane)
    Comparison to other foam blowing agents in the rigid polyurethane &
polyisocyanurate laminated boardstock end use:
    The newly listed substitutes for HCFC-22, HCFC-142b, and blends
thereof listed above in section A.2 are non-ozone-depleting, in
contrast to HCFC-22, HCFC-142b, or blends thereof. They are comparable
to other acceptable substitutes for HCFC-22, HCFC-142b, and blends
thereof in their lack of risk for ozone depletion. The newly listed
substitutes have GWPs ranging from 0 to 794, comparable to or lower
than that of other substitutes for HCFC-22, HCFC-142b, and blends
thereof. For example, the GWP of HFC-134a is about 1430 and the GWP of
HFC-245fa is about 1030.
    None of the newly listed refrigerant substitutes contain any
components that are defined as HAPs under the CAA. C3-C6 saturated
hydrocarbons, HFO-1234ze, and some components of Exxsol blowing agents
are considered VOCs under CAA regulations (see 40 CFR 51.100(s))
addressing the development of SIPs to attain and maintain the national
ambient air quality standards. EPA has received a petition to exempt
HFO-1234ze from the definition of VOC for purposes of SIPs to attain
and maintain the NAAQS on the basis that the chemical has a low
photochemical reactivity. EPA intends to address the request through
notice-and-comment rulemaking. Of the substitutes previously found
acceptable in V.A.1, above, 2-chloropropane and formic acid are VOCs.
    Among the newly listed substitutes for HCFC-22, HCFC-142b, or
blends thereof, Exxol Blowing Agents, HFC-365mfc, and C3-C6 saturated
hydrocarbons are flammable. Examples of other flammable foam blowing
agents that we previously found acceptable in this end use include 2-
chloropropane, EcomateTM, formic acid, HFC-152a, and methyl
formate. EPA believes that the flammability risks can be addressed by
existing standards from OSHA, guidelines from the manufacturer, and
other safety precautions common in the foam blowing industry.
    The toxicity risks of the newly listed substitutes for HCFC-22,
HCFC-142b, and blends thereof are low. The potential health effects of
HFO-1234ze at lower concentrations include drowsiness and dizziness.
The substitute may also irritate the lungs, skin or eyes or cause
frostbite. At sufficiently high concentrations, it may cause central
nervous system depression or irregular heart beat. HFO-1234ze could
cause asphyxiation, if air is displaced by vapor in a confined space.
These potential health effects are common to many foam blowing agents.
EPA anticipates that users in foam blowing end uses will take action
consistent with the recommendations specified in the manufacturers'
MSDSs for HFO-1234ze. EPA recommends a

workplace AEL of 1,000 ppm on an 8-hour time-weighted average for HFO-
1234ze, which is updated from our preliminary recommendation that
accompanied the acceptability listing for HFO-1234ze in several other
foam blowing end uses (74 FR 50129; September 30, 2009).\18\ Our risk
screen found that workplace exposure is likely to be well below that
level.\19\
---------------------------------------------------------------------------

    \18\ Due to additional data on toxicity, EPA is able to use a
lower uncertainty factor and recommend a higher workplace AEL
compared to the preliminary AEL analysis (where an AEL of 375 ppm
was recommended).
    \19\ The risk screen is available at http://www.regulations.gov
as item EPA-HQ-OAR-2003-0118-0250.
---------------------------------------------------------------------------

    As for the other newly listed substitutes for HCFC-22 and blends
containing HCFC-22 and/or HCFC-142b, HFC-365mfc, C3-C6 saturated light
hydrocarbons, and Exxsol blowing agents contain components with
workplace exposure limits of 500 to 1,000 ppm averaged over 8 hours,
such as WEELs from the AIHA or TLVs from ACGIH. EPA anticipates that
users will be able to meet the workplace exposure limits (WEELs, TLVs,
PELs and EPA recommendation) and will address potential health risks by
following requirements and recommendations in the MSDSs and other
safety precautions common in the foam blowing industry. Therefore, we
find the newly listed substitutes (in V.A.2, above) acceptable because
they do not pose a greater overall risk to human health and the
environment than the other substitutes available in the rigid
polyurethane & polyisocyanurate laminated boardstock end use.

B. Rigid Polyurethane Appliance Foam

    1. EPA previously found the following acceptable as substitutes for
HCFC-22, HCFC-142b, blends thereof, or for all HCFCs in rigid
polyurethane appliance foam:
     Carbon dioxide, CO2
     EcomateTM
     Formacel[supreg] TI
     Formic acid
     HFC-134a
     HFC-152a
     HFC-245fa
     HFO-1234ze
     Methyl formate
     TranscendTM Technologies, as an additive to
SNAP-approved blowing agents in blends making up to 5% by weight of the
total foam formulation.
     Water
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22, HCFC-142b, and blends thereof in rigid polyurethane appliance
foam:
     Electroset technology
     Exxsol blowing agents
     HFC-365mfc
     Saturated light hydrocarbons C3-C6 (e.g., propane, butane,
isobutane, pentane, cyclopentane, hexane, cyclohexane)
     Vacuum panels
    Comparison to other foam blowing agents in the rigid polyurethane
appliance foam end use:
    We are finding all of the newly listed substitutes for HCFC-22,
HCFC-142b, and blends thereof listed above in section V.B.2, with the
exception of vaccum panels, to also be acceptable in the rigid
polyurethane and polyisocyanurate laminated boardstock end use. Vacuum
panels have an ODP and GWP of 0, are not VOCs or HAPs, are non-
flammable, and do not present toxicity concerns. Please see section
V.A.2 for further information on the environmental and safety impacts
of the newly listed alternatives compared to other available
alternatives. For the reasons discussed above in this section and in
section V.A.2, we find that the newly listed substitutes (in V.B.2,
above) are acceptable because they do not pose a greater overall risk
to human health and the environment than the other substitutes
available in the rigid polyurethane appliance foam end use.

C. Rigid Polyurethane Commercial Refrigeration Foam and Sandwich Panels

    1. EPA previously found the following acceptable as substitutes for
HCFC-22, HCFC-142b, blends thereof, or for all HCFCs in rigid
polyurethane commercial refrigeration foam and sandwich panels:
     Carbon dioxide, CO2
     EcomateTM
     Formacel[supreg] TI
     Formic acid
     HFC-134a
     HFC-152a
     HFC-245fa
     HFO-1234ze
     Methyl formate
     TranscendTM Technologies, as an additive to
SNAP-approved blowing agents in blends making up to 5% by weight of the
total foam formulation.
     Water
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22, HCFC-142b, and blends thereof in rigid polyurethane commercial
refrigeration foam and sandwich panels:
     Electroset technology
     Exxsol blowing agents
     HFC-365mfc
     HFC-365mfc/HFC-245fa blends containing at least 5% HFC-
245fa
     Saturated light hydrocarbons C3-C6 (e.g., propane, butane,
isobutane, pentane, cyclopentane, hexane, cyclohexane)
    Comparison to other foam blowing agents in the rigid polyurethane
commercial refrigeration foam and sandwich panels end use:
    We are finding all of the newly listed substitutes for HCFC-22,
HCFC-142b, and blends thereof listed above in section V.C.2, with the
exception of HFC-365mfc/HFC-245fa blends containing at least 5% HFC-
245fa, to also be acceptable in the rigid polyurethane and
polyisocyanurate laminated boardstock end use. Blends of HFC-365mfc/
HFC-245fa containing at least 5% HFC-245fa are comparable to other
acceptable substitutes for HCFC-22, HCFC-142b, or blends thereof in the
rigid polyurethane commercial refrigeration foam and sandwich panels
end use in their lack of risk for ozone depletion. In addition, these
blends have average GWPs ranging from 870 to 960, comparable to or
lower than other substitutes (e.g., the GWP of HFC-134a is about 1430
and the GWP of HFC-245fa is about 1030). HFC-365mfc and HFC-245fa are
exempt from the definition of VOCs under CAA regulations addressing the
development of SIPs to attain and maintain the national ambient air
quality standards. HFC-365mfc is flammable. Examples of other flammable
foam blowing agents that we previously found acceptable in this end use
include EcomateTM, formic acid, HFC-152a, and methyl
formate. EPA believes the flammability risks can be addressed by
existing standards from OSHA, guidelines from the manufacturer, and
other safety precautions common in the foam blowing industry. With
regard to toxicity, HFC-245fa has an 8-hour WEEL of 300 ppm. EPA
anticipates that users will be able to meet the WEEL and will address
potential health risks by following requirements and recommendations in
the MSDS and other safety precautions common in the foam blowing
industry. Please see section V.A.2 for further information on the
environmental and safety impacts of the other newly listed alternatives
compared to available alternatives.
    For the reasons discussed above in this section and in section
V.A.2, we find the newly listed substitutes (in V.C.2, above)
acceptable because they do not pose a greater overall risk to human
health and the environment than the other substitutes available in the
rigid polyurethane commercial refrigeration foam and sandwich panels
end use.

D. Rigid Polyurethane Spray Foam

    1. EPA previously found the following acceptable as substitutes for
HCFC-22, HCFC-142b, blends thereof, or for all HCFCs in rigid
polyurethane spray foam:
     Carbon dioxide, CO2
     EcomateTM
     Formacel[supreg] TI
     Formic acid
     HFC-134a
     HFC-152a
     HFC-245fa
     HFO-1234ze
     Water
    2. EPA is newly finding the following acceptable as substitutes for
HCFC-22, HCFC-142b, and blends thereof in rigid polyurethane spray
foam:
     Electroset technology
     Exxsol blowing agents
     HFC-365mfc/HFC-245fa blends containing at least 5% HFC-
245fa
    Comparison to other foam blowing agents in the rigid polyurethane
spray foam end use:
    We are finding all of the newly listed substitutes for HCFC-22,
HCFC-142b, and blends thereof listed above in section V.D.2 to also be