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  1. #1
    Thomas Thayer's Avatar
    Thomas Thayer Guest

    Default Is this furnace exhaust vent pipe acceptable?

    Greetings - I came across this furnace exhaust vent pipe joint in a attic of a newly constructed home today (2012). I haven't seen this application before. Is this acceptable? OR, did the HVAC contractor use what he had on his truck?

    Thanks in advance,

    T.Furnace exhaust vent pipe 1.JPGFurnace exhaust vent pipe 2.JPGFurnace exhaust vent pipe 3.JPG

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  2. #2
    Join Date
    Dec 2007
    Location
    Holladay, UT
    Posts
    565

    Default Re: Is this furnace exhaust vent pipe acceptable?

    Thomas, I have seen this used before and it is allowed if allowed by manufacturer. My question would be. How did it penetrate the roof deck and what is installed above the roof deck? This material seems to be too flexible to stand up on it's own and support a cap. I would be interested to hear from a HVAC pro. By the way Brian, I really like the similar threads feature.

    Tom Rees / A Closer Look Home Inspection / Salt Lake City, Utah

  3. #3
    Join Date
    Aug 2011
    Location
    Bennett (Denver metro), Colorado
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    Default Re: Is this furnace exhaust vent pipe acceptable?

    That looks like acceptable flex flue vent. Normally, there is a label on them, describing the proper application and use.

    If you choose not to decide, you still have made a choice.

  4. #4
    Thomas Thayer's Avatar
    Thomas Thayer Guest

    Default Re: Is this furnace exhaust vent pipe acceptable?

    Thank you, gentlemen.


  5. #5
    Join Date
    Jun 2010
    Location
    San Luis Obispo
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    26

    Default Re: Is this furnace exhaust vent pipe acceptable?

    I can not see the label but that looks like a b-vent flexconnector that is used to connect an appliance collar to the base of a b-vent vent.

    If it is what I think I see, it is approved only as a connector in the same room, not to be run into the attic. It is like a appliance connector, both ends in the same room not for through a wall or anyplace.

    Again don't see a label or listing.


  6. #6
    Join Date
    Mar 2007
    Location
    Spring City/Surrounding Philadelphia area
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    3,473

    Default Re: Is this furnace exhaust vent pipe acceptable?

    It might be ok but it all depends on the material used. When I see these types of flue pipes, I grab them with my hand and give a squeeze. More than once, it has bent easily with hand pressure and turned out to be clothes dryer duct and not at all rated for the way it was being used.

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  7. #7
    Join Date
    Aug 2011
    Location
    Bennett (Denver metro), Colorado
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    1,394

    Default Re: Is this furnace exhaust vent pipe acceptable?

    Quote Originally Posted by Nick Ostrowski View Post
    It might be ok but it all depends on the material used. When I see these types of flue pipes, I grab them with my hand and give a squeeze. More than once, it has bent easily with hand pressure and turned out to be clothes dryer duct and not at all rated for the way it was being used.
    If I can't find the label, I write it up as possible non conforming use of flex vent.

    If you choose not to decide, you still have made a choice.

  8. #8
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Is this furnace exhaust vent pipe acceptable?

    I believe the material would have to be stainless steel.


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