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  1. #1
    Join Date
    Apr 2014
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    Fl
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    4

    Default Return air vent location

    Our new office has the return air and ac register located right next to each other. Within 1 inch. Is this a problem?

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  2. #2
    Join Date
    Feb 2008
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    Caledon, Ontario
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    Default Re: Return air vent location

    Most certainly, as conditioned air will be pulled right back into the return, thus defeating the purpose of the A/C, and subsequently the room air will not be cooled efficiently and such a set up will most likely result in the A/C working harder in order to satisfy the thermostat.


  3. #3
    Join Date
    Apr 2014
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    Fl
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    4

    Default Re: Return air vent location

    Quote Originally Posted by Jerry gallman View Post
    Our new office has the return air and ac register located right next to each other. Within 1 inch. Is this a problem?

    The he contractor said the ac volume of flow will blow down and away from the return so it's not a problem. The vent doesn't blow down its sides are open to allow airflow across the room not toward the flloor.


  4. #4
    Join Date
    Dec 2007
    Location
    Osceola, AR
    Posts
    310

    Default Re: Return air vent location

    Quote Originally Posted by Jerry gallman View Post
    The he contractor said the ac volume of flow will blow down and away from the return so it's not a problem. The vent doesn't blow down its sides are open to allow airflow across the room not toward the flloor.
    While this may be possible, I would have serious doubts. If there is more than one supply register then flow is divided between the ducts serving different locations. The air returning to the grille would be a fairly large volume (if this is the only return grille, the volume of air returning would be the capacity of the system minus any restrictions due to duct and so on) and would probably overcome any flow from that particular supply register.

    Alton Darty
    ATN Services, LLC
    www.arinspections.com

  5. #5
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: Return air vent location

    If your office has a dropped ceiling, tiles hanging on a framework, one of the ducts can be moved to the other side of the room.

    You could tell the building owner he is shortening the life of his AC unit by employing a goof, who is forcing it to run steady at the poorest possible efficiency.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  6. #6
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,258

    Default Re: Return air vent location

    I imagine that in Florida you will be able to answer this question for yourself very soon.

    Jim Robinson
    New Mexico, USA

  7. #7
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Return air vent location

    http://www.price-hvac.com/Catalog/Se.../SectionEG.pdf

    Return
    The return air inlet has very little effect on room air diffusion, regardless of inlet type or
    location. However, return air inlets should be located a sufficient distance from the supply
    outlet so that short‑circuiting of supply air does not occur. It may also be desirable to
    locate the returns in the stagnant zone to remove unwanted warm or cool air. For cooling, a high sidewall or ceiling return will remove warm air from the space (Figure 1).
    For heating a low sidewall return will remove warm stagnant air (Figure 2).


  8. #8
    Join Date
    Apr 2014
    Location
    Fl
    Posts
    4

    Default Re: Return air vent location

    The office is 10x18 roughly. If it's cloudy out its fine. If it's all sun then it can get warm enough to notice. I'll try to post a pic

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  9. #9
    Join Date
    Aug 2007
    Location
    Memphis TN.
    Posts
    4,311

    Default Re: Return air vent location

    Quote Originally Posted by Jerry gallman View Post
    Our new office has the return air and ac register located right next to each other. Within 1 inch. Is this a problem?
    Quote Originally Posted by Jerry gallman View Post
    The office is 10x18 roughly. If it's cloudy out its fine. If it's all sun then it can get warm enough to notice. I'll try to post a pic
    Yep!! Problem.

    *in the Summer you could try restricting 1/2 of the return on the supply side ( couple of pieces of paper should stick to the return when it's pulling air.)

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  10. #10
    Join Date
    Mar 2007
    Location
    Cape Cod, Massachusetts
    Posts
    574

    Default Re: Return air vent location

    Quote Originally Posted by Jerry gallman View Post
    The office is 10x18 roughly. If it's cloudy out its fine. If it's all sun then it can get warm enough to notice. I'll try to post a pic
    Although from the photo it looks like a bad situation, the picture doesn't tell all. I suspect that the OP may have asked the question as a self-help solution on how to fix an AC problem. We really don't know what the real problem is and do not have all the facts. The location of these two registers may not be the solution to his problem.

    The picture indicates that the supply register may be a 4-way register and the return is larger and it is an egg crate type.

    To answer the OP's question though, in general you should maintain some distance between supply and return. Distance can be achieved through physical separation or design characteristics of the registers or grilles. Supply registers should be designed to discharge air at a higher velocity than the return grilles and should be selected based on air velocity and throw distance. The return grille should be designed at a lower velocity than the supply.

    With that said, the return register may effect the throw of the supply register somewhat, but it's capture velocity wouldn't be high enough to notice in this small sized room. The supply air velocity would overshoot the most of the effect of the return grille.

    Bottom line - You should contact an HVAC professional for solutions to the problem.

    Ken Amelin
    Cape Cod's Best Inspection Services
    www.midcapehomeinspection.com

  11. #11
    Join Date
    Apr 2014
    Location
    Fl
    Posts
    4

    Default Re: Return air vent location

    The windows do not allow direct sun in. Front side looks out onto a covered service drive. Non ac. The other side to the inside of building. No direct sunlight. Thank you all for the replies.


  12. #12
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    5,005

    Default Re: Return air vent location

    Jerry

    Why not get an independent assessment from another HVAC company?

    - - - Updated - - -

    Jerry

    Why not get an independent assessment from another HVAC company?


  13. #13
    Join Date
    Aug 2007
    Location
    Memphis TN.
    Posts
    4,311

    Default Re: Return air vent location

    Quote Originally Posted by Raymond Wand View Post
    Jerry

    Why not get an independent assessment from another HVAC company?

    - - - Updated - - -

    Jerry

    Why not get an independent assessment from another HVAC company?
    It's the mans office.
    He has no control over the HVAC contractor.
    Just trying to regulate his work environment.

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  14. #14
    Join Date
    Mar 2007
    Location
    Cape Cod, Massachusetts
    Posts
    574

    Default Re: Return air vent location

    Quote Originally Posted by Billy Stephens View Post
    It's the mans office.
    He has no control over the HVAC contractor.
    Just trying to regulate his work environment.
    Changing the distance between registers won't help.

    - - - Updated - - -

    Quote Originally Posted by Billy Stephens View Post
    It's the mans office.
    He has no control over the HVAC contractor.
    Just trying to regulate his work environment.
    Changing the distance between registers won't help.

    Ken Amelin
    Cape Cod's Best Inspection Services
    www.midcapehomeinspection.com

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