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  1. #1
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    Default furnace vent material

    This is the first time I have seen this material used for a furnace vent. Its an fan assisted induced draft gas furnace. New construction. It has a reversed connection and an unscrewed connection as well.

    In addition to that, I suspect this material in not correct. Is this flexible accordion aluminum wrong for use as a vent connector?

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  2. #2
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    Default Re: furnace vent material

    John,

    I believe most of the major manufacturers make a flexible b-vent now. I think Simpson calls theirs "Dura-Connect". Not a whole lot different from regular b-vent installation requirements. They need proper slope and support. The primary visual difference is the fitting at each end. Looks like there was a fitting in the pic that you posted.

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  3. #3
    Ron Bibler's Avatar
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    Default Re: furnace vent material

    Did it have a label or any information ?

    Best

    Ron


  4. #4
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    Default Re: furnace vent material

    Quote Originally Posted by Ron Bibler View Post
    Did it have a label or any information ?

    Best

    Ron

    No label on the flexible portion. The fittings were listed as B-type. The flexible portion was soft aluminum. I could easily crush it with my fingers. I thinks it's aluminum dryer duct. The upper fitting was not screwed together.

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  6. #6
    Ron Bibler's Avatar
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    Default Re: furnace vent material

    I think you are correct John.

    Best

    Ron


  7. #7
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    Default Re: furnace vent material

    John,

    If you look at the pic that you posted, the corrugations appear to spiral up the material. That is typical for the Dura-Connect product and possibly the others. If you look at the pic in the link that you provided, the corrugations do not spiral but are concentric. Without actually being there, I would say that it is an approved material.

    However, you mention that the upper fitting was not screwed together. Did it have a fitting?

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  8. #8
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    Default Re: furnace vent material

    Gunnar,

    In post # 4 above is the picture of the upper connection.


  9. #9
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    Default Re: furnace vent material

    Shouldn't the approved material be stainless steel? This stuff was aluminum. Look at the first picture I posted. Near the bottom you see a small dent. I did that with moderate pressure of my thumb. It's not steel. No way.


  10. #10
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    Default Re: furnace vent material

    Quote Originally Posted by John Dirks Jr View Post
    Shouldn't the approved material be stainless steel? This stuff was aluminum. Look at the first picture I posted. Near the bottom you see a small dent. I did that with moderate pressure of my thumb. It's not steel. No way.
    Actually, the inner liner of a Simpson DuraVent b-vent is aluminum. I don't think any standard b-vent is stainless.

    Yes, the stuff is pretty fragile. If you are uncomfortable with the material or installation, let your client know.

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  11. #11
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    Default Re: furnace vent material

    John, I think this is what you have there.
    http://www.americanmetalproducts.com...20-%20ADFC.pdf


  12. #12
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    Default Re: furnace vent material

    Quote Originally Posted by David O'Keefe View Post
    You're on the trail there.

    Here is what I found with further searching. Check page 24 of the following. It says its aluminum double wall B vent.

    http://www.americanmetalproducts.com...dition%204.pdf


    I'll write up the loose unscrewed connection and leave it at that.

    Thanks everyone.


  13. #13
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    Default Re: furnace vent material

    John, The instructions I have also say it is aluminum (#6 in instructions). It also says sheet metal screws are not necessary.


  14. #14
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    Default Re: furnace vent material

    I'm not sure, but when they say screws are not needed, I think they mean when the connector is attached to other American Metal Products.

    It is snapped in tight at the bottom to a similar product. But, at the top where is transitions to standard B-vent, the connection is loose. There is no positive connection holding it together up there. Even one screw to hold it in place would be nice.


  15. #15
    Jack Murdock's Avatar
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    Default Re: furnace vent material

    John,
    What is the end away from the furnace connected to? Those connectors are used when installers are too lazy to use all b-vent or single wall when appropriate clearances can be met. B-vent should not be used on a draft induced appliance (non-condensing) unless its going into a working chimney properly sized for the appliance(s) with a good draft and/or liner. Greetings from rain soaked NY State. Jack


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