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  1. #1
    Join Date
    Mar 2020
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    Return air location. Don't believe my contractor.

    Hi, all, I would greatly appreciate a second opinion. I recently had a remodel done in southeast Texas, and the HVAC sub installed a small in-bedroom 12"x12" return air (was supposed to be a jumper but he ducted it straight to the plenum next to the blower). The problem is he installed it two feet from the register in that room. I'm pretty sure I've learned at some point that these should be 3 feet at a minimum and common sense dictates it shouldn't be close or the return will just pull air from the vent. Also, every other jumper- return in my house is across the room from the register.

    Does this pass muster for you guys?

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Never heard of a 3 rule supply / return.

    Opposites ends of the room maybe.

  3. #3
    Join Date
    Oct 2011
    Location
    Culver, Oregon (Central OR)
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    There is no rule but that is way too close. Needs to be moved.

  4. #4
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    Nothing is true just because you “heard it somewhere.”
    If the supply register has the proper throw, then they are correct. The return doesn’t pull hard enough to short cycle the air.
    If the air in the room mixes properly then the temperature in the room will be even. Tell us if the room is evenly cooled.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


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  5. #5
    Join Date
    Oct 2011
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    Culver, Oregon (Central OR)
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    Quote Originally Posted by kdean1 View Post
    Nothing is true just because you “heard it somewhere.”
    If the supply register has the proper throw, then they are correct. The return doesn’t pull hard enough to short cycle the air.
    If the air in the room mixes properly then the temperature in the room will be even. Tell us if the room is evenly cooled.
    Properly mixed is the operative phrase. That is highly doubtful.

  6. #6
    Join Date
    Oct 2011
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    Culver, Oregon (Central OR)
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    Quote Originally Posted by kdean1 View Post
    Nothing is true just because you “heard it somewhere.”
    If the supply register has the proper throw, then they are correct. The return doesn’t pull hard enough to short cycle the air.
    If the air in the room mixes properly then the temperature in the room will be even. Tell us if the room is evenly cooled.
    Properly mixed is the operative phrase. It's highly doubtful.

  7. #7
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    Quote Originally Posted by Adlerberts-Protege View Post
    Properly mixed is the operative phrase. It's highly doubtful.
    It depends on the register. Cheap ones won’t accomplish it. Air velocity and throw will achieve it. We can discuss theory all we want.
    The OP has to tell us if the room is evenly conditioned.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  8. #8
    Join Date
    Mar 2020
    Posts
    2
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    Thread Starter
    Thanks all. Sorry for late response, at first I was getting email notifications and then I stopped selling them.

    The room is brand new, so I'm not for sure yet if it cools evenly.

    That being said, this morning I found out he laid duct over the long run of PVC flue I have which was enough to put a dip in it, water collected in the flue, and the over heat started tripping on the burner.

    When I found it I dumbly corrected it and swoosh! There weren't all the water, overwhelmed the drip line and I ended up finding probably more than 3 cups of water out of the inducer.

    Yeah, I don't have high hopes that the return air placement was the product of deep contemplation.

  9. #9
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    Sorry to hear that. The PVC should be supported every 4 feet.

    It sounds like you need to have the entire system assessed.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  10. #10
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    I just found a short youtube video that demonstrates the difference between behavior of air at supply and return locations.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  11. #11
    Join Date
    Oct 2011
    Location
    Culver, Oregon (Central OR)
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    Quote Originally Posted by kdean1 View Post
    I just found a short youtube video that demonstrates the difference between behavior of air at supply and return locations.
    That is all true. Thermal stratification plays a large part as well. I would make sure that room is sealed up good.

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