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  1. #11
    Join Date
    Jul 2009
    Location
    Northeast
    Posts
    661

    Default Re: Add Cold Air Returns

    That doesn't explain why you say oval is worthless, if you don't need it that,s one thing but if you do it's way to get the air back. Works fine I might also add.

  2. #12
    Join Date
    Jul 2009
    Location
    Northeast
    Posts
    661

    Default Re: Add Cold Air Returns

    Quote Originally Posted by Bob Gabrilson View Post
    We all agree (those who know) that the return should be sized larger than the supply. .1 static when sizing supply and .08 when sizing the return. I'm saying (my belief) is that air will take the path of the least resistance. That's why the dampers are in the supplies to balance were the supply will go. If there are enough returns and you add a 6 inch oval duct
    (80 CFM? at best) what good is it really going to do? I would install a 14X6 transfer grille if possible. Cheaper and roughly 160 CFM.
    Your statement has nothing to do with what the OP was asking, they asked if there was a way they could run duct in the wall, oval works.

  3. #13
    Join Date
    Feb 2010
    Location
    Iowa, Quad-Cities area
    Posts
    129

    Default Re: Add Cold Air Returns

    Oval may be better than nothing, perhaps. But there are other (better) ways. My simple mind tells me that you have to get the air there first and foremost. I've seen plenty of 2-story homes (old gravity systems) with no returns to the second floor work beautifully.

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