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  1. #1

    Is it possible to calculate the CFM of a blower motor?

    I have a old furnace. The blower motor had been changed. I can see the RPM of the motor but I also think it depends on the size and diameter of the cage portion. Is there a formula for caluclating the CFM?

  2. #2
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,962
    You can calculate the cfm by multiplying the temperature rise of the air between the return side of the furnace and the supply side of the furnace by 1.08 and dividing the output Btu of the furnace by the sum of the temperature rise calculation.

    It is not just the motor rpm and blower wheel size that determines the cfm of air. It is also dependent on the static pressure of the overall system.
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