– Some tests must be performed in "as-built," others in "at-rest" or "operational" states. Verify which state applies before testing.
This test ensures that air always flows from cleaner areas to less clean ones, creating a "pressure cascade" that prevents cross-contamination. Impact of the 2019/2021 Revisions iso 146443pdf 2021
If you specifically need the 2021 national adoption: – Some tests must be performed in "as-built,"
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