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The ACH should reflect expected pressure differences across the building envelope during normal occupation/operation (just like the 4x other "Design Flow Rate Calculation Methods"). So yes, closer to 4Pa (than 50Pa or 75Pa).
The ACH should reflect expected pressure differences across the building envelope during normal occupation/operation (just like the 4x other "Design Flow Rate Calculation Methods"). So yes, closer to 4Pa 4 Pa (than 50Pa or 75Pa).