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. By comparison a typical office space would be 5 10 times more dirty. This part of iso 14644 does not provide for classification of particle populations that are outside the specified lower threshold particle size range 0 1 µm to 5 µm.
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