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    Blower Door Test Calculations


    Here's how HEAT calculates Air Changes Per Hour and the CFM Natural on the Air Infiltration Screen:

    ACH = CFM * 60 /Volume
    CFMnat = CFM * 0.052 * S Factor * Weather Factor


    Interested in using the ASHRAE calculator?  Click here

    Want to learn how half floors affect air flow? Click here

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