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Old 04-25-2010, 04:54 PM   #1
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bathroom exhaust fan

I need to install a bathroom fan. I'd like to use a fantech in-line fan system because I've got a long run and it's quiet. The house is brick, 210 years old so the vent has to go through the roof, which is metal.

Bath is on 2nd floor, there is a finished 3rd floor so the exhuast pipe will run between beams and up through a corner and out.

Q. I have a 4" stack vent already in place and very accessible. Is there any reason I can't add a T and vent the exhaust out thru the stack? That would save a lot of time and money. All other plumbing is below the proposed intersection.



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Old 04-25-2010, 05:40 PM   #2
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Please don't use a plumbing stack to vent your fan---There are so many things wrong with that--

Once you reach the attic--can you exit through the soffit? I don't like the idea of punching a hole in a metal roof--I'd sooner cut the brick----Mike---

That in-line fan could just as easily pull the exhaust to the basement--is that an option?


Last edited by oh'mike; 04-25-2010 at 05:42 PM.
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Old 04-25-2010, 05:56 PM   #3
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i didn't think the stack was viable option but it was worth the ask.

Going down thru the basement isn't an option.

Might be able to work it through the soffit. We had to remove the box gutter and etend the eves so there might be enough leeway to work it thru.

Walls are 16" thick, it's possible to get through but given the exit points available it will be too close to the corner. So we'll seek a way through the soffit and then the roof as a last resort.

Thanks Mike
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Old 04-25-2010, 06:44 PM   #4
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Also against code to use the stack
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