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  1. #1
    Join Date
    Oct 2019
    Posts
    5
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    Confused Umm, is this ductwork safe?

    I bought my house in 2017, and only now noticed that my high-efficiency furnace has both the exhaust and intake ducts merge before they exit the attic through the roof. I checked the diagrams in the Rheem installation instructions, and none of them show this configuration.

    (Incidentally, every now and then my low pressure switch stays open and the furnace short cycles.)

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  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,397
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    That’s acceptable

  3. #3
    Join Date
    Oct 2019
    Posts
    5
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    Thread Starter
    Hello, thanks for the reassurance. If this is okay, how is it that carbon monoxide isn't being drawn back into the furnace and distributed through the home? I don't get it.

  4. #4
    Join Date
    Jan 2010
    Location
    Central Texas
    Posts
    255
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    Looks like it has a Concentric Vent Kit. Think of it as a tube inside of another tube. The inner tube is where the combustion gas exit, the outer tube is where the combustion air is drawn in.

  5. #5
    Join Date
    Oct 2019
    Posts
    5
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    Thread Starter
    Ahh! That explains it. Thanks a lot.

  6. #6
    Join Date
    Sep 2007
    Location
    State College, PA
    Posts
    2,737
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    It is called a concentric vent. You may need to google that to see a picture of it. It should be what you see on the roof.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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