Furthermore, pressure as well as humidity and temperature must be kept at a constant level in the clean room in order to create consistent production conditions at all times. People themselves are often the cause of contamination of the room air.
Therefore, in addition to the use of special work equipment and tools, specific work clothing - also known as cleanroom clothing - must be worn. This, in turn, must be adapted to the respective cleanroom class; in addition, overcoats for the shoes, head hoods, and frequently also a mouth guard are required.
When an employee moves from one cleanroom to the next, he or she usually also has to change clothes. In addition, personnel and material locks including appropriate filter and ventilation systems as well as special floor mats ensure that no contamination occurs.