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Thread: CFM Equation?




  1. #1
    Join Date
    Aug 2003
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    Darwin, Australia
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    Is there a mathematical way to work out how much cfm a fan is pushing? just curious coz i found some reallllly old fans the otherday and theres no specs at all...

    :cheers:

    The Evolved One

  2. #2
    Join Date
    Apr 2003
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    there isn't an equation that i know of to compute the cfm, but if there was it'd need to be really complex, taking into account the efficiency of the fan design (angle of the blades) and the rpm.

  3. #3
    Join Date
    Sep 2003
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    Quote Originally Posted by The Evolved One
    Is there a mathematical way to work out how much cfm a fan is pushing? just curious coz i found some reallllly old fans the otherday and theres no specs at all...

    :cheers:

    The Evolved One
    Yep with a CRAY and a highly sophisticated modeling system. Much easier to just measure it.

    CFM dosn't matter much anyway... It's all bout airspeed BABY :)
    3544mhz 295FSB
    2.4C P4C800-E
    KHXPC3200 234mhz
    22254 Ghettocooled
    22532 3DM01

  4. #4
    Join Date
    Jul 2003
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    cfm...isn't that airflow of your computer? If it is...doesn't that really matter? It would also drop the cpu temp about 5 degrees?
    CPU: Opteron 165 @ 311x9 - 2817.8 mhz - 1.47v
    Mobo: Abit KN8-SLI
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    GFX: Asus EAX1950pro @ 648/1408
    PSU: Thermaltake 500w
    SC: Audigy 2 zs
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  5. #5
    Join Date
    Sep 2003
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    CFM is a volume/time measuremnt. a large fan can move a higher volume at even a slow speed. Convective cooling in regards to AIR is 99% dependent on two variables. AIRSPEED and AIR TEMPERATURE. Unfortunately fan manufacturers do not measure airspeed as it is not consistant across the diameter of a fan.:(
    3544mhz 295FSB
    2.4C P4C800-E
    KHXPC3200 234mhz
    22254 Ghettocooled
    22532 3DM01

  6. #6
    Join Date
    Sep 2002
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    1,636

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    just in case someone doesnt know CFM stands for CubicFeetperMinute.
    So X rating in CFM means how many (X) CUBIC FEET (1ft x 1ft x 1ft) can a fan move in 1 minute.
    :2cents:

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