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Thread: calculating cfm

  1. #1
    Join Date
    Oct 2005
    Location
    Charlotte,N.C
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    how can I calculate the cfm per ton of a system using your temp.drop and static pressure can't remember formula and how can you figure static pressure with digital monometer thanks for the help

  2. #2
    Join Date
    Jul 2005
    Location
    Orange County, NY
    Posts
    936
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    Buy a static pres. tip for you manometer, drill hole, stick tube in and read pressure.

    Don't have a tip. ...use a small piece od 1/4 inch copper tube and just insert the tube about 1 inch into the duct.

    As for airflow what do you really want to know? Actual CFM at discharge or actual BTU's of your evap. coil?

    Core

  3. #3
    Join Date
    Jul 2005
    Location
    Orange County, NY
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    Velocity = 4005 * (square root) of Velocity pressure

    CFM = area * Velocity

    Core

  4. #4
    Join Date
    Oct 2005
    Location
    Charlotte,N.C
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    cfm discharge

  5. #5
    Join Date
    Aug 2003
    Location
    Central Kentucky
    Posts
    6,248
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    Do you have the fan performance data for the piece of equipment you are working on?
    Have you set up a Google alert for Carbon Monoxide yet?
    Click here to find out how.

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