NASA Standard NHB5340.2

Bioclean room class Max. No. of particles greater than 0.5 Max. No. of particles greater than  5

Max. No. of microbe particles

Average microbe fall per week
pcs/ft3 (pcs/l) pcs/ft3 (pcs/l) pcs/ft3 (pcs/l) pcs/ft3 (pcs/l)
100 100 (35) 01 (0.0035) 1,200 (12,900)
10000 10,000 (350) 65 (2.3 0.5 (0.0176) 6,000 (64,600)
100000 100,000 (3,500) 700 (25) 2.5 (0.0884) 30,000 (323,000)
 

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