EN ISO 14644 Norm

Classes by type of air particle cleaning for clean rooms and protected zones.

Classification Number

ISO CD 14644.1 (1996)

Maximum admissible concentration (particles per m3 of air) for particle dimensions equal or superior to:
0,1 μm 0,2 μm 0,3 μm 0,5 μm 1 μm 5 μm
ISO 1 10 2        
ISO 2 100 24 10 4    
ISO 3 1000 237 102 35 8  
ISO 4 10000 2370 1020 352 83  
ISO 5 100000 23700 10200 3520 832 29
ISO 6 1000000 237000 102000 35200 8320 293
ISO 7       352000 83200 2930
ISO 8       3520000 832000 29300
ISO 9       35200000 8320000 293000