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  1. #1
    Join Date
    Jan 2012
    Location
    Riyadh, Saudi Arabia
    Posts
    16

    Exhaust Fan Formula

    Is there any formula in selection of a exhaust fan in order to meet the requirement of a certain room or area? Shall we say bathroom or kitchen. Thanks for help.

  2. #2
    Join Date
    Jun 2010
    Location
    Philadelphia PA
    Posts
    2,198

    A "rule of thumb"

    would have you figure the total cubic feet of air in the space and then figure how much exhaust you need to change that air X times Fill in for X 3 to 7 air changes

    So room volume times air changes divided by 60 will give you CFMs of exhaust
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  3. #3
    Join Date
    Jan 2012
    Location
    Riyadh, Saudi Arabia
    Posts
    16
    How could you determine the total cubic feet of air in that space? Is there any standard to be follow or table in reference of any space regarding with the cubic feet of air in it? Thanks ahead

  4. #4
    Join Date
    Jan 2004
    Location
    Atoka, TN
    Posts
    42
    Quote Originally Posted by zero13 View Post
    How could you determine the total cubic feet of air in that space? Is there any standard to be follow or table in reference of any space regarding with the cubic feet of air in it? Thanks ahead
    (L X W X H = CF)

  5. #5
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by zero13 View Post
    Is there any formula in selection of a exhaust fan in order to meet the requirement of a certain room or area? Shall we say bathroom or kitchen. Thanks for help.
    International Mechanical Code section 4 will give you the ventilation rates that are required for specific applications.

    Length times width times height equals cubic feet.

  6. #6
    Join Date
    Jan 2012
    Location
    Riyadh, Saudi Arabia
    Posts
    16
    Thanks people, i just thought that there are standard for any specific rooms to be follow. thank so much to everyone.

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