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Thread: CFM's

  1. #1
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
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    CFM's

    How many CFM's of air will a 4" ducting carry ? I know 6" will carry approximately 96 CFM's but not sure how much a 4" would be able to carry, I"m guessing somewhere around 30 - 45 CFM's is this close or is it less than 30CFM's.

  2. #2
    Join Date
    Feb 2005
    Location
    In a van by the river
    Posts
    618
    Under what kind of static pressure?
    ## + years in the field never made you a know-it-all This industry is far more diverse than you are

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,928
    20 at 229FPM
    30 at 344FPM
    40 at 459FPM
    50 at 573FPM
    60 at 688FPM
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
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    1,582
    What's the 20, 30, 40 referring to static ?

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,928
    CFM

    40 CFM at 459 FPM.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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