How frequently must non-viable particle sampling be performed in an ISO Class 5 primary engineering control?

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Multiple choice — select the best answer

ADaily
BWeekly
CAnnually
DAt least every six months

✓ Correct answer: D. At least every six months According to USP standards, non-viable particle sampling in ISO Class 5 environments must be performed at least every six months to verify air quality certification and proper HEPA filter function.

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How frequently must non-viable particle sampling be performed in an ISO Class 5 primary engineering control?

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