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  1. #1

    Is it normal to have a supply line run through a return (wall cavity)

    I was taking off my return register and notice the supply line that runs upstairs from the basement runs through the return to get there. This is is how the system had been set up since the house was built (1975). Also is it ok to have a wall cavity (space between joist) serve as a return to your furnace.

  2. #2
    Join Date
    Aug 2004
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    Kentucky, Michigan, Ohio, Arizona, Colorado, Nevada, and Califormia
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    318
    wall cavities (internal) are commonly used for return air.
    "Surprised ?! If I woke up tomorrow with my head sewn to the carpet, I wouldn't be more surprised."
    Clark Griswold

  3. #3
    Join Date
    Aug 2004
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    Kentucky, Michigan, Ohio, Arizona, Colorado, Nevada, and Califormia
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    having a supply run through the return is not common. Does it interfere with the return air ?
    "Surprised ?! If I woke up tomorrow with my head sewn to the carpet, I wouldn't be more surprised."
    Clark Griswold

  4. #4
    Join Date
    May 2006
    Location
    Dallas,tx
    Posts
    291
    Quote Originally Posted by steppinthrax View Post
    I was taking off my return register and notice the supply line that runs upstairs from the basement runs through the return to get there. This is is how the system had been set up since the house was built (1975). Also is it ok to have a wall cavity (space between joist) serve as a return to your furnace.
    can you take picture?

  5. #5
    Join Date
    Dec 2006
    Posts
    280
    by this do you mean you have an open return (as in no ductwork after the register) with the supply duct running through that space? if so, thats pretty common (commercial anyway)...

  6. #6
    Join Date
    Jul 2007
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    Beautiful, Philadelphia, the City of Brotherly Love!
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    1,075
    If the system works it is ok, just leave it alone and put the register back, go watch TV before it breaks.

  7. #7
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    5,990

    Thumbs up

    For A/C it should be OK and very rare.

    For plumbing, I would say U have a problem.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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