Cleanroom Classifications

Cleanroom classifications are established by the measurement of Number of particles 0.5 micron and larger that are contained in 1 m³ of sampled air. Classification is given on two different conditions:

1. At rest:
At rest means all the equipment are installed in a clean room and HVAC system is operational but manufacturing activity is stopped. It means the area is cleaned and no operating personnel is performing manufacturing activity.

Grade A:
≥0.5 micron=3520 particles/m3
≥5.0 micron=29 particles/m3

Grade B :
≥0.5 microns=35200 particles/m3
≥5.0 micron=293 particles/m3

Grade C:
≥0.5 microns=352000 particles/m3
≥5.0 micron=2930 particles/m3

Grade D:
≥0.5 micron=3520000 particles/m3
≥5.0 micron=29300 particles/m3

2. In Operation:
In operation means all the equipment are installed in a cleanroom and HVAC system is operational and manufacturing activity is going on with specified number of working personnel

Grade A:
≥0.5 micron=3520 particles/m3
≥5.0 micron=29 particles/m3

Grade B:
≥0.5 microns=352000 particles/m3
≥5.0 micron=2930 particles/m3

Grade C:
≥0.5 micron=3520000 particles/m3
≥5.0microns=29300 particles/m3

Grade D:
≥0.5 microns=Not Defined.
≥5.0 micron=Not Defined.

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