SMB Validation

What are the clean room class limits according ISO Standard 14644-1?

Clean room maintained virtually free of contaminants, such as dust or bacteria, are used in laboratory work and in the production of precision parts for electronic or aerospace equipment.
In the clean room standard ISO 14644-1 "Classification of Air Cleanliness" the classes are based on the formula:

Cn = 10N (0.1 / D)2.08 (1)
where
Cn = maximum permitted number of particles per cubic meter equal to or greater than the specified particle size, rounded to whole number
N = is the ISO class number, which must be a multiple of 0.1 and be 9 or less
D = is the particle size in micrometers



ISO
Class
Maximum Number of Particles in Air
(particles in each cubic meter equal to or greater than the specified size)
Particle size
> 0.1 µm
> 0.2 µm
> 0.3 µm
> 0.5 µm
> 1 µm
> 5 µm
ISO Class 1
10
2
ISO Class 2
100
24
10
4
ISO Class 3
1000
237
102
35
8
ISO Class 4
10,000
2,370
1,020
352
83
ISO Class 5
100,000
23,700
10,200
3,520
832
29
ISO Class 6
1,000,000
237,000
102,000
35,200
8,320
293
ISO Class 7
352,000
83,200
2,930
ISO Class 8
3,520,000
832,000
29,300
ISO Class 9
35,200,000
8,320,000
293,000