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Our building has a single fan that supplies outside air to multiple AHUs. Do we need to perform outside air testing at the supply fan or at all AHUs?

Outside air measurements need to be tested at the system level, and so measurements would need to be taken at each AHU, not just the single supply fan.

Question: 

Our building has a single fan that supplies outside air to multiple AHUs. Do we need to perform outside air testing at the supply fan or at all AHUs?