Normen, Compliance & Hygiene
Cleanroom Class (ISO 14644)
A cleanroom class defines the maximum permissible number of particles of a given size per cubic metre of air in a room, classified according to ISO 14644-1.
In industrial practice, the cleanroom class is not a laboratory metric but a fundamental decision for construction and operation. It determines the entire building services concept: air change rate, filter stages, pressure cascades between zones, material airlocks and personnel routing.
A higher class means exponentially higher construction and operating costs. The key planning question is therefore not how clean a facility can be, but which class each process step actually requires.
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