HVAC performance qualification

Hi,

I am conducting PQ for HVAC system in the next month. I intend to devide the qualification period into 2 phases: first week for “at rest” condition, and then about 4 weeks for “in operation”. I notice that there are two ways to conduct the PQ of HVAC system. The first one is qualify each AHU seperately and the second one is qualify each criterion seperately. I wonder if the first one is acceptable.

To be clear, my facility is designed to be complied with D class GMP.

Thank you.

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