Class 4 Cleanroom is the fourth classification type of the ISO 14644-1 classification standard, the ISO Class 4 Cleanroom corresponds to a Class 10 Cleanroom in the FED-STD-209E Cleanroom classification.
The maximum allowable particles for particles for a ISO Class 4 Cleanroom are below:
0.1 µm : 10000 per cubic metre
0.2 µm : 2370 per cubic metre
0.3 µm : 1020 per cubic metre
0.5 µm : 352 per cubic metre
1 µm : 83 per cubic metre
