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  1. #1
    Join Date
    Jul 2004
    Posts
    2
    where can i find the the return grille fitting loss
    i m trying to calc. the pressure loss in the duct work from return air duct to heat pump

    thanks

  2. #2
    Join Date
    Jul 2004
    Posts
    2
    the size is 26 by 33 in. i dont really know the spacing. how do i check if there is any volume damper on it?

  3. #3
    Join Date
    Oct 2001
    Location
    Waterford Michigan
    Posts
    2,668
    We use .03 iwc

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