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    rodneycwhitney's Avatar
    rodneycwhitney Posts: 2, Reputation: 1
    New Member
    		  
    #1

    May 10, 2008, 05:20 PM
    A/C Return Air Calculations
    Can anyone provide the formula for calculating the return air register size on home a/c units. Thanks.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 10, 2008, 06:07 PM
    Quote Originally Posted by rodneycwhitney
    Can anyone provide the formula for calculating the return air register size on home a/c units. Thanks.
    THESE ARE OLD STANDARDS. They are generic in nature. A manual D is the proper way to determine duct/return air size. Use with caution.


    http://www.karg.com/PDF%20files/Pres...Wis%202003.pdf
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