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Jump to: navigation, search HVAC systems use ventilation air
ducts installed throughout a building to supply conditioned air
to a room through outlet vents, called diffusers; and ducts to
remove air through return-air grilles.      The invention of the
components of HVAC systems went hand-in-hand with the industrial
revolution, and new methods of modernization, higher efficiency,
and system control are constantly introduced by companies and
inventors worldwide. The three central functions of heating,
ventilating, and air-conditioning are interrelated, especially
with the need to provide thermal comfort and acceptable indoor
air quality within reasonable installation, operation, and
maintenance costs. HVAC systems can provide ventilation, reduce
air infiltration, and maintain pressure relationships between
spaces. The means of air delivery and removal from spaces is
known as room air distribution.[2]  The starting point in
carrying out an estimate