For iso class 8 particles smaller than 0 5 µm aren t considered.
Iso 8 clean room design.
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Iso 8 clean rooms do not require certain particle sizes to be tested either because concentration levels are too high or low to be tested but it cannot be zero.
A class 100 000 iso 8 cleanroom having a low occupancy rate low particle generating process and positive space pressurization in relation to adjacent dirtier cleanliness spaces might use 15 ach while the same cleanroom having high occupancy frequent in out traffic high particle generating process or neutral space pressurization will.
The concentration of particles that are 0 5 µm should be below 3 520 000.
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Usually manufacturers will define an airborne particulate concentration standard class such as iso 14644 1 iso 8 at rest outline gowning and a pressure cascade regime defining a clean corridor design or a dirty corridor design.