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  1. #1

    Default Appliances with Common Venting

    This seems like a pretty easy question, I just can't find (or maybe I have) what I'm looking for to describe it, but here goes... I've got a furnace and a water heater (both gas) venting to a common B-vent. I'm fairly certain that there needs to be an increase in size of pipe above/at the connection of the two appliances. Am I remembering this correctly?

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  2. #2
    Join Date
    May 2007
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    Default Re: Appliances with Common Venting

    The GAMA venting tables might help you figure out the answer Reis.

    Even though I don't trust them it will give you something to refer to.
    Hope they help.

    I don't know why they continue to allow common venting.

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  3. #3

    Default Re: Appliances with Common Venting

    Just in case you are not clear, I'm including a picture of the correct installation for double venting.


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  4. #4
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    Default Re: Appliances with Common Venting

    ?????
    .

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  5. #5

    Default Re: Appliances with Common Venting

    Quote Originally Posted by Billy Stephens View Post
    ?????
    .
    It's a JOKE Billy! See the little "sarcastic" smiley at the end?

    I almost fell over when I found this one I was laughing so hard. Talk about a hack job!
    this was one of the wildest I've seen in a while. Good thing both units of this beachfront duplex were still vacant and the water heaters were not lit. I disconnected both gas lines (BTW, both were fed from one 1/2" gas line) so they would not be used until corrected.
    Dana

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  6. #6

    Default Re: Appliances with Common Venting

    That's fantastic! Dana, can I use that photo for a presentation??

    Cheers,
    Reis


  7. #7
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    Ormond Beach, Florida
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    Default Re: Appliances with Common Venting

    That photo should be titled *How to Kill Someone Without Even Trying*.

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  8. #8

    Default Re: Appliances with Common Venting

    Quote Originally Posted by Reis Pearson View Post
    That's fantastic! Dana, can I use that photo for a presentation??

    Cheers,
    Reis
    Be my guest Reis.
    Dana

    True Professionals, Inc. Property Consultant
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  9. #9
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    Mar 2007
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    Spring City/Surrounding Philadelphia area
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    Default Re: Appliances with Common Venting

    Reis, I'm not sure about the vent pipe sizing thing but the setup in your pic already has a large condensate stain on it and is strap supported with what appears to be a plastic strap.


  10. #10

    Default Re: Appliances with Common Venting

    Quote Originally Posted by Nick Ostrowski View Post
    Reis, I'm not sure about the vent pipe sizing thing but the setup in your pic already has a large condensate stain on it and is strap supported with what appears to be a plastic strap.
    I got the condensate stain (it's worse in the unit) which is what sparked the whole "yes, I think this is wrong" movement. And the support strap is metal... I think if it were plastic it would have some pretty good warping happening by this point (6 yr old home). But, thanks!


  11. #11
    Join Date
    May 2008
    Location
    Burleson, Texas
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    Default Re: Appliances with Common Venting

    Reis, on any combo vent set up the common vent must be increased by one pipe size.

    Dylan Whitehead

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