NF S90-351

Risk
class

4

3

2


Particulate
cleanliness class

ISO 5

ISO 7

ISO 8


Particles
elimination kinetics

CP 5

CP 10

CP 20


Microbiological
cleanliness class

M1

M10

M100


Differential pressure
negative/positive

15 Pa ± 5 Pa

15 Pa ± 5 Pa

15 Pa ± 5 Pa


Temperature
range

19° to 26° C

19° to 26° C

19° to 26° C

Air flow speed
in the area
to be protected

Unidirectional flow

Unidirectional flow
Or no-unidirectional flow

No-unidirectional flow


Other specifications,
minimum values

Airflow zone speed
from 0.25 m/s to 0.35 m/s

Fresh air rate of minimum or equal to 6 volumes per hour

Change rate of minimum or equal to 15 volumes per hour

Change rate of minimum or equal to 15 volumes per hour