Take for example a manufacturer of precision optical lenses for a defense application that is plagued with dirt particles large enough to see with the naked eye. The particulates range in size from about 15-30 microns and number in the range of 5,000-7,000 per cubic foot. Utilizing the Clean Room Classification Chart, they can see that they would require an ISO6, Class 1,000 room to reduce the number of 15-30 micron particles to under 10 per cubic foot.
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