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  1. #14
    Join Date
    Sep 2004
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    bornriding - The Carrier spec shows the same wheel for both motors (10x6).

    eisenberg - I am not a motor expert so I would wait to see replies from some others on this site that may know more about motors before changing anything just yet. The Carrier spec should be correct unless there is a typo in the documentation. I also would wait on changing duct sizes until you decide what you are going to do about the CFM issue.
    How high are your ceiling registers and is the return high or low?

  2. #15
    Join Date
    Jul 2005
    Orange County, NY
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    Hello all


    BTW: The motor only runs RPM, it is the wheel ( or cage ) that determines CFM, at whatever RPM the motor turns

    CFM and RPM are proportional "Fan Laws"

    Fan Law #1

    An increase in CFM = a direct proportional increase in RPM

    A decrease in CFM = a direct proportional decrease in RPM

    Static pressure changes as the "Square" of RPM change/Ratio

    and of course Brake horsepower or just horsepower changes as the "Cube" of the RPM or CFM.

    So the bigger motor has more RPM and produces a greater CFM so it must have a greater HP rating as per fan laws.

    P.S. Forget changing the motor and go here----> and enjoy your air conditioning!!

    Good luck


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