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Plumbing Code - Can I tie my bathroom exaust fan into the main plumbing vent to the outside.

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Plumbing Code - Can I tie my bathroom exaust fan into the main plumbing vent to the outside. johnnymo 10-31-2006
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Posted by Smellblog on November 2, 2006, 8:29 am


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Grandpa wrote:
> JoeSpareBedroom wrote:
> >> Cool...I am fixing this house to live in, but not very long (~5 years),
> >> so I wanna stay close to code so that people won't make me fix it when
> >> I go to sell the house.
> >>
> >
> > Be sure to wire the pipe as far up in the vent as possible, so moisture is
> > blown all the way out. Otherwise, it's possible to have condensation on the
> > inside of the metal vent, which may drip back down again. I wondered about
> > this with mine, so I've observed while the shower as on full blast. You
> > should do the same when you're done.
> >
> >
> I sure hope you are talking about one of the attic vents and not the
> sewer vent, Joe. Sounds like Johnny wants to hook into the sewer vent
> pipe stack which will cause all sorts of trouble when he wants to sell
> the house. Not to mention that "wonderful" odor he'll be trying to track
> down in his bathroom on those occasional days.
>
> My advice Johnny, is don't tap into the sewer vent stack unless you
> intend to use it to dump sewage into.
>
> --
> Grandpa


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Posted by Bill Gill on November 1, 2006, 9:20 am


johnnymo wrote:
> Hello - I bought an older house and I am renovating and making my half
> bath a full bath. I wanted to install an exhaust fan in the bathroom,
> but it is not very convienent to send it to the side of the house and I
> don't won't to bother cutting a hole in the roof. So, I was wondering,
> since the main air vent to both bathrooms is directly above my new
> bathroom, can I have piece of PVC installed so that my exhaust vent
> blows into the air vent? Is this code worthy?
>
> Thanks for the suggestions...
>
> John
>
I see you have a long thread about this, but I didn't
see one of the simplest answers. The sewer stack isn't
big enough. The vent fan needs a 4 inch line. For a
sewer vent plus a fan vent you need a 6 to 8 inch
line. I doubt if you have a sewer stack that large.

The proper way is to run the vent fan in a 4 inch
metal vent pipe to its own outside vent.

Bill Gill

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