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  1. #1
    Join Date
    May 2019
    Posts
    73
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    What's the worst?

    Got a friend who has an 80% propane Rheem forced air furnace in his shop on a stand so it sucks right in the top and blows out the bottom. The flue goes up 3' then 90s over about 5' then 90s down about 3' so it doesn't pass in front of a window then 90s over another 3' clears the window then 90s up 2' then 90s out the wall. Exhaust feels like it's blowing pretty good outside. What's the worst that could happen? I really want to check the combustion on it but he owns his own plumbing/heating company and I don't want to insult him.

  2. #2
    Join Date
    Jun 2003
    Location
    Texas
    Posts
    1,512
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    not good imo

  3. #3
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    7,288
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    The worst that can happen is that someone will be poisoned by carbon monoxide and the owner will be sued. He needs to be insulted for venting it that way.
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  4. #4
    Join Date
    Dec 2006
    Location
    Vancouver, B.C.
    Posts
    877
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    First think you need to do before anything else is to take a photo of that install and post it in the wall of shame thread.

    Second thing you should do is ask him what he thinks about the install of the venting and have a healthy discussion about it. If he owns a heating company he should be aware of the issue already. I can’t imagine why he wouldn’t have fixed it already.


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  5. #5
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,624
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    What is "overfire draft"? What is air temp rise?

  6. #6
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    27,162
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    Look up the venting requirements in the IOM please!

  7. #7
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,624
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    Quote Originally Posted by pecmsg View Post
    Look up the venting requirements in the IOM please!
    X2,
    also look up the "Venting requirements" tables/charts/guidelines/DEMANDS

  8. #8
    Join Date
    Mar 2015
    Location
    Tx
    Posts
    1,419
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    If he would install his own furnace this way, how bad is his installs of his customers ? Just because he owns his own company doesn't mean he is not a dumb ass .

  9. #9
    Join Date
    Aug 2018
    Location
    Piedmont Triad, NC
    Posts
    786
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    Wall of shame, wall of shame, wall of shame 😁 We need pics.

  10. #10
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    10,719
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    Apparently he does not realize you can vent those straight up and out the roof!

    80% draft induced furnaces can not be vented out a side wall they must be in a negative flue pipe. The inducer is not designed to push the flue gases only get them into the flue which takes it from there via natural draft. Even if that was a 90% vented in PVC it would be wrong.

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