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  1. Trevor_Lambert | | #1

    There is no ACH50 number that will always provide adequate ventilation. It's measured at a pressure differential. No pressure, no air change. Even a very leaky house will have inadequate ventilation with still outside air.

  2. Matthew_Salkeld | | #2

    Thanks Trevor, I'm reading https://www.greenbuildingadvisor.com/article/revisiting-ventilation. Under 5.0ACH50 a home is deemed to require whole house ventilation.

  3. Jon_R | | #3

    It depends on the definition of "safe". Short term high exposure to pollutants is sometimes compensated for by later low exposure.

    Code uses 5 ACH(50).

    Removing a question after answers are provided is obnoxious.

    1. Matthew_Salkeld | | #4

      Sorry for the offense Jon, I think my question was premature.

      I would like to make some posts about the serious divergence of two realities I see in my practice - code imposed air tightness and that HRVs are not being run properly or at all. It seems to rest on the antiquity of the HRV control strategy.

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