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  1. #1
    Join Date
    Nov 2004
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    440
    I saw something really weird the other day... I was in a basement, and saw a 90%+ furnace. Two pvc pipes coming out of it, intake and exhaust. Here's where it got strange... The pipes went up from the furnace, turned and went under the floor joists, and CONNECTED together and ran out of the house as ONE pipe. This did not make any sense to me at all. All of the 90%+ systems I have ever seen have had two pipes all the way out.

    Can anyone explain this to me?

  2. #2
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    34,902
    Do you mean actually connected together with a fitting or ran outside next to each other though a larger PVC sleeve? I see what you mean and if that is the case that they are glued togeather with a fitting, that is a little strange

    [Edited by James 3528 on 08-29-2005 at 12:16 PM]

  3. #3
    Join Date
    Nov 2004
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    440
    I wish now that I had taken a picture of it. The two pipes came together in a "Y" and exited as one pipe. It wasn't just a larger sleeve that housed both pipes.

  4. #4
    Join Date
    Nov 2000
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    Coastal Georgia
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    That is weird. I probably have seen four 90% installs in my area and I did them because they were spec'ed that way . I agree, that just does not make sense. Might be some new kind of pipe on the market that keeps them seperated inside.

  5. #5
    Join Date
    Apr 2003
    Posts
    469
    Was it a concentric connection?

  6. #6
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    If it were concentric it would make sense that at the Y the diameter would just about double at that point and out athe house.

    I was thinking much of the same thing but this would mean rapid condensation of the exhaust air in the pipe.

  7. #7
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    34,902
    Explained here> http://aireheating.com/Furnace%20gallery.html


    Oh gosh! I'am right! it does double.





    [Edited by James 3528 on 08-29-2005 at 12:45 PM]

  8. #8
    Join Date
    Sep 2004
    Posts
    3,157
    By the looks of the pic both of the 2" lines going into the fitting , the straight pipe in the center will run up the center of the 3"pipe --call it the exhaust- and the other will get its supply air from the surrounding area encompased in the 3"

  9. #9
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    The intake is up against the house. They wouldn't put the exhaust up against the wall. Look close at the picture. The furnace is on. You can see the fumes from the middle pipe.

  10. #10
    Join Date
    Nov 2004
    Posts
    440
    That was exactly like what I saw. Thank you James 3528 for doing the research on this!

    (I'll be able to sleep better at night now that I know what they did...) LOL

  11. #11
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    34,902
    You're welcome.

  12. #12
    Join Date
    Nov 2000
    Location
    Coastal Georgia
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    34,902
    Technically, that is not a Y but a 45 degree branch fitting.


    I think


  13. #13
    Join Date
    May 2000
    Location
    Colorado flatland native
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    15,067
    Originally posted by James 3528
    Technically, that is not a Y but a 45 degree branch fitting.


    I think


    Technically it's a y and a 45
    My doctor gave me six months to live, but when I couldn't pay the bill he gave me six months more.
    Walter Matthau

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