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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 johnnymo on October 31, 2006, 2:43 pm



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


Posted by on October 31, 2006, 3:30 pm



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


No. It won't pass code and for good reason. Do you want sewer gas
coming into your bathroom?


Posted by on October 31, 2006, 3:33 pm



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

No. Except there's a water-trap, you can only connect draing piping to
the
outside, via drain line or vent. Sewer gas can be explosive, and it's
happened
that contractor cracks a gas main near a sewer line, with natural gas
getting into house with dry trap. With house coming apart in a
fireball.

This was a block away.

So you see why sewer venting is not a "convenience" thing.

J


Posted by johnnymo on October 31, 2006, 3:40 pm



Ok...I am no plumber and makes good sense, but is there enough pressure
in the air vent to push the "sewer gases" sideways and down to my
exhaust fan. I was thinking as long as I don't create a direct route I
would be ok. I just wanted to tie on to the side, kind of like my sink
is right now.

Thanks for the suggestions. I guess I will do a little more research.


Posted by JoeSpareBedroom on October 31, 2006, 3:44 pm


>
> Ok...I am no plumber and makes good sense, but is there enough pressure
> in the air vent to push the "sewer gases" sideways and down to my
> exhaust fan. I was thinking as long as I don't create a direct route I
> would be ok. I just wanted to tie on to the side, kind of like my sink
> is right now.
>
> Thanks for the suggestions. I guess I will do a little more research.
>

The flex hose from mine is wired to the inside of one of the existing roof
vents. It works fine. When I re-roof soon, I'm having it routed to its own
vent, but you could get away with jury-rigging it, if necessary.



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