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  1. #1
    Join Date
    Apr 2012
    Posts
    7

    Adding additional return

    I have a 5 ton system with a single 18" flexduct return that comes in to the plenum box before the blower at a 90 degree angle. My tech wants to add a 12" flexduct return to service the other side of the house that will come in to the plenum box inline with the blower. There will be a dampener on the starting collar to regulate flow. Are there any issues with having one return inline and one at 90 degrees if he puts a dampaner on the inline one?

  2. #2
    Join Date
    May 2008
    Location
    Central Fla.
    Posts
    309
    Should be fine, probly won't need the damper.

  3. #3
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,322
    Agree with twincam, I'd leave damper out. Should be fine.

  4. #4
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    435
    I'd have him install at least a 14" flex. That'll put you right around 2000 CFM of return. Of course, that doesn't factor the restriction of the return air grills or the duct friction loss.
    With your chrome heart shining in the sun, long may you run.

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