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It is essentially a cookbook of standardized test methods. Without Part 3, two different engineers could test the same room and get completely different results because they used different sampling rates, different probe angles, or different counting methods. Part 3 removes that ambiguity.
The real question is:
ISO 14644-3 specifies test methods and procedures to verify that cleanrooms and associated controlled environments meet the requirements defined in ISO 14644-1 (classification by airborne particle concentration) and to support ongoing compliance. It covers acceptance testing and periodic monitoring of installed systems, equipment and control measures. Iso 14644-3.pdf
Measuring air velocity, volume flow rate, and uniformity to ensure proper air exchange and distribution. It is essentially a cookbook of standardized test methods
Often called the "Integrity Test," this verifies that filters are installed correctly and are free from leaks that could bypass the filtration system. The real question is: ISO 14644-3 specifies test