An aseptic clean room is an environment that can be used as a chemical lab, being characterized by absence of contaminated air, i.e. by a very low level of aerosol particles.
The atmosphere of the environment (which is also known as cleanroom) is strictly controlled in terms of atmospheric pressure and environmental pollutants. Its functioning is based on recirculating filtered air in a sealed environment.
In aseptic clean rooms, air purity can be higher compared to those of operating rooms. Usually the staff of an aseptic clean room wears protective clothing, boots, hoods, and face masks and is trained not to compromise air purity.