cleanroom

This term is defined in ECSS-Q-ST-70-01C as
room in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimize the introduction, generation and retention of particles inside the room, and in which other relevant parameters, e.g. temperature, humidity and pressure, are controlled as necessary [ISO 14644-6]

This term is defined in ECSS-Q-ST-70-02C as
room in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimize the introduction, generation, and retention of particles inside the room, and in which other relevant parameters, e.g. temperature, humidity, and pressure, are controlled as necessary [ISO 14644-6]

This term is defined in ECSS-S-ST-00-01C as
clean area controlled according to specified levels