A cleanroom facility is a room in which the concentration of airborne particles is kept very low in order to enable special manufacturing processes or research activities that require a high level of cleanliness. Cleanroom facilities are classified according to various standards that define the permissible number of particles per unit volume of air. Various measures are required to operate a cleanroom facility, such as special ventilation and air conditioning technology, suitable room design and equipment, appropriate work clothing and technology as well as personnel and material airlocks.