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  1. #1
    Join Date
    Oct 2007
    Location
    Elora, Ontario
    Posts
    2

    round duct CFM readings

    I seem to recall reading eons ago in an old Carrier manual that one could do quick and dirty CFM calculations by taking a single traverse in the centre of round ducts and multiplying this by a factor of less than 1 -- thinking 0.9??? Does anyone recall what this factor might be?

  2. #2
    Join Date
    Jan 2010
    Location
    Vancouver Island
    Posts
    338
    0.9

    Sent from my SGH-I747M using Tapatalk 2

  3. #3
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,645
    What do you mean by a single traverse? Diameter?

  4. #4
    Join Date
    Jan 2010
    Location
    Vancouver Island
    Posts
    338
    He means one reading in the center of the duct. Quick and dirty method to give quick and dirty results.

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  5. #5
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,038
    Got a really straight section?

  6. #6
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,645
    Quote Originally Posted by BALloyd View Post
    He means one reading in the center of the duct. Quick and dirty method to give quick and dirty results.

    Sent from my SGH-I747M using Tapatalk 2
    Gotcha.....thx.

  7. #7
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    Anybody know how close that will get you?

  8. #8
    Join Date
    Oct 2007
    Location
    Elora, Ontario
    Posts
    2
    Thanks!

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