Results 1 to 12 of 12

Thread: Venting a dryer

  1. #1

    Venting a dryer

    I have a customer who is moving their washer/dryer to an inside closet (no outside walls) and would like me to vent the dryer down the inside of the wall to under the house and then to the outside. The problem is that there is only 3-1/4 to 3-1/2" inside the wall cavity max so I can't get a 4" galvanized pipe in there. I could use one of those 2 x 6 rectangular galvanized boxes but how would you every clean it out. PVC is out of course because of the static electricity problem. The customer would prefer not to drill a 4" hole in their floor.

    I would appreciate any suggestions. Thanks!

  2. #2
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    One word, Oval.
    Karst means cave. So, I search for caves.

  3. #3
    Join Date
    May 2004
    Location
    Austin, TX
    Posts
    1,732
    As said above you can get oval pipe, and even rectangular pipe that can
    fit in the wall to get below the house. Cleaning it out should be as easy
    as getting under the house (crawl space).

    I would rather cut a hole in the floor, than cut the wall, and the bottom
    plate of the wall though.

  4. #4
    Join Date
    Sep 2010
    Location
    Western, MO
    Posts
    871
    If under the house is unconditioned, make sure you insulate or clean it out a couple of times a year. Dryers don't like long vent runs.

    jim
    Common sense isn't very common anymore.

  5. #5
    Join Date
    Jan 2001
    Location
    Pamnyra VA.
    Posts
    709
    Oval the round pipe ,get one of those dryer boxes, clean it out with a electric leaf blower with no tubes on it (blowerf only).

  6. #6
    Oval is a great idea. Unfortunately, here in Hattiesburg, MS there is no supplier that carries any single wall oval galvanized duct (they even have to order the 2 wall oval). I've called all my local suppliers and no one can even order it. I've got someone who can fabricate it but they're a bit pricey.

    Can anyone point me to an online source where I can get the single wall oval and the two oval to 4" round 90's??

    It certainly would be easier to just cut 4" round hole in the floor, but this is a historic home and they would prefer not to do that.

    Thanks,

    David

  7. #7
    Join Date
    Jan 2007
    Location
    N.E. Ok.
    Posts
    1,348
    25' maximum length with 90's counting 5'.
    Unless the dryer instructions state different.

  8. #8
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Take round pipe and step on it, ta da, now you have oval pipe.
    Karst means cave. So, I search for caves.

  9. #9
    Join Date
    Jun 2011
    Location
    Brooklyn, NY
    Posts
    29
    u might be able to use what they call "wall stack" - it's rectangular, not oval..
    Check http://www.graymetal.com/ , they have an online catalog (page 16 ?)... or call them up.

  10. #10
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,403
    Quote Originally Posted by karsthuntr View Post
    Take round pipe and step on it, ta da, now you have oval pipe.
    Or I could step on it, then it'd be flat pipe!
    "If you call that hard work, a koala’s life would look heroic."

    VETO PRO PAC, The Official Tool Bag of HVAC-Talk.com

    Testo... you guys rule!

  11. #11
    Join Date
    Sep 2010
    Location
    Western, MO
    Posts
    871
    Periscope pipe?

    jim
    Common sense isn't very common anymore.

  12. #12
    Join Date
    Jul 2002
    Location
    Yuma, AZ
    Posts
    2,361
    I presume they want the vent in the wall so the drier can sit closer to the back of the closet.

    I would make my 4 inch hole so the 4" round pipe touched the far side of the wall and protruded 1/2 " into the closet. Then I would seal the hole gaps in the floor and cover the exposed venting in the wall with drywall or metal and seal that as well. This would minimize pressure drop and cleaning issues. (Post 7 has the rules, and I would try not to go over 20' equivalent length. Coversions will add serious friction to the venting.)
    "I have never let my schooling interfere with my education."
    Mark Twain
    More at: http://www.quotationspage.com/subjects/education/

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