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  1. #1
    Join Date
    Jul 2004
    Posts
    68

    Hmm

    What are the formulas for calculating cfm on oil,natural gas and LP furnaces? Btu input x ? divided by 1.08 x delta T

  2. #2
    Join Date
    Apr 2002
    Posts
    11,808
    CFM=OUTPUT/(1.08 x delta T)

    Clock the furnace, measure efficiency to get output
    The way we build has a greater impact on our comfort, energy consumption and IAQ than any HVAC system we install.

    http://www.ductstrap.com/

  3. #3
    Join Date
    Mar 2005
    Location
    South/West of Quebec in the other part of Canada
    Posts
    2,331
    here is another one for you..Electric furnace...

    volts x amps x 3.14 = btu output

    btu output/ 1.08 x temp rise

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