Class 3 Cleanroom is the third classification type of the ISO 14644-1 classification standard, the ISO Class 3 Cleanroom corresponds to a Class 1 Cleanroom in the FED-STD-209E Cleanroom classification.
The maximum allowable particles for particles for a ISO Class 3 Cleanroom are below:
0.1 µm : 1000 per cubic metre
0.2 µm : 237 per cubic metre
0.3 µm : 102 per cubic metre
0.5 µm : 35 per cubic metre
1 µm : 8 per cubic metre
