 The main workstation isolator, in which the sterile product is exposed, is therefore protected from contaminated air as the toxic product should be exhausted via the buffer zone before it reaches operators working outside of the isolation.In addition to Isolators, there are also extensive barriers that provide sub-isolation protection, but have a very good track record of reducing hazards to sterile drugs during processing when they are designed and operated properly.This extensive barrier is known as a restricted access barrier system, or RABS.