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Do all filter material makers and filter manufacturers use the same methods for testing their products ?

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Do all filter material makers and filter manufacturers use the same methods for testing their products ?

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The procedure, fortunately, is clear. Having leak-tested the system and sealed the leaks, take a sample of the air in the room with a Millipore-type filter, both, for biologic and sample under a microscope, classify, identify, and take necessary steps to eliminate the source.

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