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Thread: Creating proper ACH in home

  1. #1
    Join Date
    Jul 2009
    Location
    Columbia, MD
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    Creating proper ACH in home

    Say one had no fresh air in a home and wanted to use a box fan with open windows. How could I calculate ACH

    house is 3000sqft


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  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
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    Thread Starter
    Trying to create the standard 4 ACH


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  3. #3
    Join Date
    Oct 2016
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    If you google air changes per hour a formula will pop up.

    It’s cfm x60/volume of structure = ACH

    So if you had 8 ft ceilings you would need to bring in 1600cfm of outside air...if my math is correct.


    Edit...that would be 4 ACH of fresh air. Would overwhelm your normal residential hvac system...

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