how do you determine the volume of the return air duct work
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  1. #1
    Join Date
    Feb 2005
    Posts
    3
    I want to re-route the return air. How do I determine the volume and do I need to adjust the volume if I introduce a bend?

  2. #2
    Join Date
    Sep 2004
    Location
    Fort Worth, Texas
    Posts
    586
    There is a book for that one, Manual D. I would call a professional, however.
    Installs, Changeouts, & Heat Stroke.....not necessarily in that order

  3. #3
    Join Date
    Jun 2004
    Location
    4H: Hot, Humid Houston H.O.
    Posts
    3,304
    You might consider re-asking your question using different wording. It's not clear whether you are a DIY-er, such is against the rules on this board, but as far as I am concerned you are not proven to be.

    Manual D is the really professional way to design ducts. I wonder what percentage of HVAC guys-for-hire have used it in the last year. Another tool is measuring external static pressure, which combined with a pro's opinion can tell you a lot about overall adequacy of your duct system. It cannot shed any light on room-by-room issues however.

    Good luck -- Pstu

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