A buffer room set at the entrance and exit of a clean room, provided to block contaminated airflow from the outdoors or adjacent rooms and to control the pressure difference.

[Reference] An air lock refers to a sealed space with two doors, only one of which may be opened at a time; its purpose is to control the airflow between rooms like an air gate when people need to enter or exit.

[Reference] Pressure control is an effective measure to prevent the infiltration of contamination. Sometimes, when the pressure difference required between the two sides is too large and difficult to achieve, an air lock can be provided.