What are grey rooms?

Like clean rooms, grey rooms focus on avoidance and carryover of particular matter soiling that can be found especially in technical productions and processes. The regulation VDA19 by the German Association of the Automotive Industry contains definitions for the cleanliness analysis:

SaS0 (Cleanliness level 0) Non-regulated area

SaS1 (Cleanliness level 1) Clean zone is separated by means of markings/walls

SaS2 (Cleanliness level 2) Permanently installed grey room with clean air equipment

SaS3 (Cleanliness level 3) Clean room with ‘room-in-room system’ (see clean rooms) 

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