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    heyhayes's Avatar
    heyhayes Posts: 1, Reputation: 1
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    #1

    Jun 20, 2017, 03:00 PM
    CFM on My Heil model NDGG100DF01 SERIAL: L874250516
    What is the CFM of my Heil furnace Model NDGG100DF01
    Serial # L874250516
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jun 20, 2017, 03:35 PM
    Depends on the speed of the air handler blower. They can be set a number of ways. Typically there are 3 speed settings, marked on the motor. Low, medium and High. You may have a blower with more speeds and thus more CFM. Look at the motor, it will show you what color combinations you can use for the different speeds. You would use a velometer to determine CFM

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