cleanroom

320px|thumb|right| Entrance to a cleanroom with no air shower thumb|right| Cleanroom used for the production of microsystems. The yellow (red-green) lighting is necessary for [[photolithography, to prevent unwanted exposure of photoresist to light of shorter wavelengths.]] thumb|right| Cleanroom from outside thumb|right| Cleanroom for microelectronics manufacturing with [[fan filter units installed in the ceiling grid]] thumb|right| Cleanroom cabin for precision measuring tools thumb| Typical cleanroom head garment

A cleanroom or clean room is an engineered space that maintains a very low concentration of airborne particulates. It is well-isolated, well-controlled from contamination, and actively cleansed. Such rooms are commonly needed for scientific research and in industrial production for all nanoscale processes, such as semiconductor device manufacturing. A cleanroom is designed to keep everything from dust to airborne organisms or vaporised particles away from it, and so from whatever material is being handled inside it.