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 primary authority in the us and canada is the iso classification system iso 14644 1. This standard applies in general to all cleanrooms.
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