This standard includes the cleanroom classes iso 1 iso 2 iso 3 iso 4 iso 5 iso 6 iso 7 iso 8 and iso 9 with iso 1 being the cleanest and iso 9 the dirtiest class but still cleaner than a regular room. The equivalent fed standard is class 100 000 or 100 000 particles per cubic foot. The iso 14644 1 2015 introduces the need of iso 21501 4 particle counters which assure all cleanroom certification is based on verified data accuracy and reliability.
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