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  • FPM to CFM

    I need to measure the amount of cfm in a 24" pipe, I can calculate the FPM but how can I convert to CFM.

  • #2
    Re: FPM to CFM

    You need to multiply the feet per minute times the cross-sectional area of the pipe.

    Make sure all units are the same base unit.

    feet/minute * square feet = cubic feet/minute

    The formula for the area of a circle is Pi*radius², with radius being 1/2 the diameter.

    Is the 24" the inside diameter? If so then:
    3.14 * (1 foot * 1 foot) = 3.14 square feet

    FPM * 3.14 square feet = CFM

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    • #3
      Re: FPM to CFM

      I need to know 500 FPM = how much CFM

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      • #4
        Re: FPM to CFM

        That depends on the cross-sectional area of the pipe. (or river or whatever it is)

        feet/minute (FPM) * square feet = cubic feet/minute (CFM)

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        • #5
          Re: FPM to CFM

          How do you calculate the cross sectional?

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          • #6
            Re: FPM to CFM

            The formula for the cross-sectional area of a pipe is:

            Area = Pi * radius2

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            • #7
              Re: i need to find out how much cfm s i need

              I need to find out how many cfms i need to in a 1000 square foot space with 12 foot ceilings

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              • #8
                Re: FPM to CFM

                you will need
                1200 cfm

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                • #9
                  Re: FPM to CFM

                  Originally posted by Unregistered
                  you will need
                  1200 cfm
                  According to ASHRAE you will need to know what the space is used for and or how many people are going to be in it (if in the usa). most office spaces require 20cfm/person of outdoor air alone! and then whatever u need for cooling, usually .5cfm/sq ft. you should call a hvac contractor as i've been out of the business for about 5 years and dont have the latest figures, but that's what it was when i was designing systems, good luck!

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                  • #10
                    Re: FPM to CFM

                    Originally posted by mflanagan View Post
                    how do you calculate the cross sectional?
                    1000fpm how mach cfm

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                    • #11
                      Re: 800 cfm = howmany fpm

                      i want to know if a package unit ac has 800 cfm how i know that what is its fpm

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                      • #12
                        Re: FPM to CFM

                        21000ed;59945]you will need
                        1200 cfm[/QUOTE]

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                        • #13
                          Re: FPM to CFM

                          6" pipe, 806 fpm, 885fpm, 649 fpm, 570 fpm what are the cfms?

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                          • #14
                            Re: FPM to CFM

                            Originally posted by Kato View Post
                            6" pipe, 806 fpm, 885fpm, 649 fpm, 570 fpm what are the cfms?
                            If the inside diameter is 6" or 0.5 ft, area is (pi/4)*diameter² or 0.19635 ft²
                            Multiply by the flow rate for approximate cubic feet per minute.
                            806 ft/min gives 158 ft³/min

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                            • #15
                              Re: i need to find out how much cfm s i need

                              Originally posted by britt44 View Post
                              I need to find out how many cfms i need to in a 1000 square foot space with 12 foot ceilings
                              Its one cfm per sqft. and 5cfm delutionary air (fresh air) per ocupent.

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