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Frequently Asked Question - Cleanroom Section
 
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   Frequently Asked Questions in Cleanroom Construction and Maintenance   Limits for Cleanroom Microbial Contamination

Grade
Air Sample cfu/m3
Settle Plates Diam 90 mm cfu/m3
contact Plates Diam 55 mm cfu/m3
Glove Print 5 fingers cfu/glove
A
<1
<1
<1
<1
B
10
5
5
5
C
100
50
25
-
D
200
100
50
-

Note
Grade A and B correspond to with class 100, M 3.5, ISO 5
Grade C correspond to with class 10000, M 5.5, ISO 7
Grade D correspond to with class 100000, M 6.5, ISO 8