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  1. #1
    Join Date
    May 2008
    Posts
    4
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    Question Air Flow Changes per hour

    i'm trying to get the formula to calculate how many times the air flow changes in a room an hour ? The air handler's Capacity is 7,000 cfm, 15 hp running 100% outside air to 5 rooms the average size of each room is 21'L X 17'W X 10' H... and if i should use the 250 to 500 scale to measure the cfm to get to the conclusion?
    THANK YOU!!!
    DMC357

  2. #2
    Join Date
    Dec 2007
    Location
    Connecticut
    Posts
    968
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    Hi DMC357,
    The formula is (( CFM * 60 ) \ room cuft. )
    To get ACPH for each room, you will have to measure the cfm at each room. Good luck.

  3. #3
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,266
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    21*17*10 = 3570 CF per room

    3570 CF * 5 = 17850 CF

    7000 CFM * 60 Min/Hr = 420000 CFH

    420000 CFH / 17850 CF = 23.5 ACH



    Damn. That's one air change every 2.55 minutes.
    Perhaps you should have read the instructions before calling.

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    70,023
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    Or, 17,850 CF/7,000 CFM =2.55 minutes.
    60 minutes divided by 2.55 minutes =23.529 ACH.


    Either way, thats a lot of air, and energy to condition it.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    May 2008
    Posts
    4
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    Thanks

    Guys Thanks for your help. I LOVE THIS SITE

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