Results 1 to 5 of 5
  1. #1

    Common Return on Air/Heating System

    Hello everyone,

    I had an very old home that I upgraded in the Dallas area. It used to have a common return in the Den. When we upgraded, we ran flex duct under the house.

    However, critters like the flex duct. Turns out, most of the underside is now paved. I could heavy vinyl over what little dirt is still exposed. Just to keep the mosture smell down. Then seal off the house crawl space like any other room and remove the old duct. This in essense would make the entire crawl space a return.

    I could even put in a prefilter under the house as getting in the crawl space is easy and the access at that point is about 3 Ft.

    Would that work? Could I have a common return under the house that pulls from the floor grates and just eliminate duct?

    I am thinking that if I don't seal to tightly then a little bit of fresh air might be a good thing and help keep down dust.

    Thoughts? Help?

    Hans

  2. #2

    Gas Leak

    It occurred to me that a gas leak under the house might be a problem with the above scenario. But I am not sure. I would think I would smell it.

    Comments?

    Hans

  3. #3
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by Hans_N_Heidi View Post
    It occurred to me that a gas leak under the house might be a problem with the above scenario. But I am not sure. I would think I would smell it.

    Comments?

    Hans

    i dont know, but i think a gas leak under the house would be dangerous under any circumstance



    .

  4. #4
    Join Date
    Sep 2007
    Location
    Boise, ID
    Posts
    4,167
    Although technically a return plenum is something that is fairly common, your circumstance is not.

    You would be asking for all sorts of problems, mold, dry rot, code violations, just to mention a few.

    If your willing to go to all the trouble and expense to "seal" off the space why not just get a contractor out there to install sheet metal duct? That will keep the critters out.

    .

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,750
    Currently, your crawlspace is not conditioned.
    If you use it for a return plenum, you will be paying to heat your crawl space.
    Run new duct, it will save you in the long run.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event