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Thread: Flex vent pipe

  1. #1
    John Stephenson's Avatar
    John Stephenson Guest

    Default Flex vent pipe

    Last edited by John Stephenson; 12-22-2007 at 07:05 AM.
    OREP Home Inspector E&O Insurance 2

  2. #2
    Join Date
    May 2007
    Location
    Frankfort, KY
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    Default Re: Flex vent pipe

    Quote Originally Posted by John Stephenson View Post

    What is causing the white staining at the vent connection spillage?
    More than likely flue gases condensing inside the flue due to no post purge cycle.
    Underfiring of the furnace is another very likely culprit.

    Measured Performance more than just a buzzword

  3. #3
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    Default Re: Flex vent pipe

    If it does not have a label on in, I would not "assume" that is it listed.

    Could be, but without a label - I would not say it's okay ... I'm not the AHJ and cannot give it my blessing without labeling or testing.

    "Could" it have been labeled" Sure, but the label is also supposed to be permanent, meaning it is not supposed to fall off.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4
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    Mar 2007
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    Near Philly, Pa.
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    Cool Re: Flex vent pipe

    Appears to be flexible liner used as a vent connector, for which it is not approved or listed. There are listed flex connectors, which are heavier, stiff and carry listing lablels. This appears to be liner adapted with single walled pipe into B-vent above and below. No draft hood connector, lack of proper support, oversized liner. Cannot use single walled connector in attics regardless if flex or rigid.

    I recommend the entire run be done by a qualified HVAC tech using the same brand of B-vent installed to the listing. Then, have him inspect the unit and test it for proper setup.

    Keep the fire in the fireplace.

  5. #5
    Join Date
    Mar 2007
    Location
    Chicago, IL
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    Default Re: Flex vent pipe

    BTW, when you do encounter listed flex B-Vent, this may be helpful:

    http://www.duravent.com/docs/instruct/L206A_Sep01.pdf

    Last edited by Michael Thomas; 05-28-2007 at 05:44 PM.

  6. #6
    Richard Rushing's Avatar
    Richard Rushing Guest

    Default Re: Flex vent pipe

    Reference the white staining:

    I have found that this condition really rears it's ugly head in the winter when the cold air of the attic meets the hot air gasses. The 'white' comes from the gas.

    As David said, this could very well be an indication of the heater units purge cycle being much too short. At least, that was the way I was skuled.

    Rich


  7. #7
    Join Date
    Mar 2007
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    Lake Barrington, IL
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    Default Re: Flex vent pipe

    John,

    Sorry I don't have a pic but there are flex vents that are designed for venting water heaters and furnaces. You will recognize these because they come with an adapter on the ends for connecting into rigid vents - the adapters are not field installed was in your pictures. What you saw is wrong.

    Eric Barker, ACI
    Lake Barrington, IL

  8. #8
    Join Date
    Mar 2007
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    25,307

    Default Re: Flex vent pipe

    Quote Originally Posted by Eric Barker View Post
    John,

    Sorry I don't have a pic but there are flex vents that are designed for venting water heaters and furnaces.
    There are flexible CONNECTORS, not vents, which "connect" the appliance to the vents.

    I'm not aware of any "flexible vents".

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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