Results 1 to 8 of 8
  1. #1
    Join Date
    Oct 2007
    Location
    Arizona
    Posts
    85

    Default High Efficiency Furnace Vent Question

    Are there any requirements for the vents to have caps or elbows installed to keep rain out? I can see moisture staining in the cabinet from the air intake. Assuming you wouldn't want rain getting into the exhaust vent either! Thanks for your help!

    ScreenHunter_117 Nov. 03 11.58.jpg

    Similar Threads:
    Member Benefits1

  2. #2

    Default Re: High Efficiency Furnace Vent Question

    I have never seen high efficiency vents located through the roof like that.

    Regarding the lack of a suitable boot in the photo, what is the substance used to weatherproof the vents? It looks like plasticine modelling clay.

    GRANT MEDICH
    1st Call Home Inspection, LLC
    Rockford, Michigan

  3. #3
    Join Date
    Mar 2007
    Location
    Peoria Arizona
    Posts
    79

    Default Re: High Efficiency Furnace Vent Question

    On a Goodman Condensing furnace, they say that the combustion air supply pipe should be pitched slightly downward at the inlet to prevent water from entering the pipe. (the diagram has what appears to be an elbow on the end of it)

    There is nothing on the exhaust pipe. It just shoots straight up into the air. (it looks like there may be tubing running from the base of the vent pipe to a condensation pipe or drain)

    Jeff


  4. #4
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,682

    Default Re: High Efficiency Furnace Vent Question

    rain down exhaust would drain through secondary HX drain. Intake usually does a candy cane to shield when vertically oriented. Some codes require larger diameter once outside to prevent ice plugs. See listed instructions and local codes.

    Keep the fire in the fireplace.

  5. #5
    Join Date
    Oct 2007
    Location
    Arizona
    Posts
    85

    Default Re: High Efficiency Furnace Vent Question

    Quote Originally Posted by Grant Medich View Post
    I have never seen high efficiency vents located through the roof like that.

    Regarding the lack of a suitable boot in the photo, what is the substance used to weatherproof the vents? It looks like plasticine modelling clay.

    Pretty standard in this part of the country when furnaces are installed in the attic space. There is a boot installed where the pipes pass through the roof and it's finished off with mortar around the tile. Sounds odd, I know.


  6. #6
    Join Date
    Mar 2012
    Location
    Lansdale, PA
    Posts
    876

    Default Re: High Efficiency Furnace Vent Question

    I don't see many venting though a roof, but from what I recall they typically have an elbow. I believe you would have to refer to manufacturer's requirements to for the answer.


  7. #7
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,352

    Default Re: High Efficiency Furnace Vent Question

    Mark and the others are correct. Check the manufacturer's instructions, and it will almost always say to have the intake protected with an elbow down, like a candy cane. The exhaust should stay straight up so the condensate doesn't drip onto the roof. Make sure to check that they didn't get them switched, which can cause problems. Two weeks ago I had a concentric vent that got switched, and was causing lots of corrosion inside the furnace for obvious reasons.

    Jim Robinson
    New Mexico, USA

  8. #8
    Join Date
    Oct 2007
    Location
    Arizona
    Posts
    85

    Default Re: High Efficiency Furnace Vent Question

    Thank you for your help!


Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •