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Old 09-08-2009, 09:17 PM   #1
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Need advice on two adjoining bathroom fans


So I have two bathrooms next to each other. They are both on the outer edge of the house (e.g. can exhaust through siding).

But I'm getting mixed answers on how to handle the two fans.

-Can bathroom fans exhaust to a side wall? Or is this a no-no? One bathroom's vent would be about 3ft long to the wall. The second bathroom's vent would be would be a bit longer (6ft?). I just had a new $6k roof put in, so I'm hesitant to put a roof vent on it. (Previous owners put it on, its an old farm house so it didn't have a fan).

-If venting through the wall is a no-no, can I:
(a) Install 2 separate fans, but T them into one roof vent? (or one wall vent?)
(b) Install an inline fan in the attic for both bathrooms?

With Option (a), would bathroom 1's exhaust get pushed into bathroom's 2 if only one is on?

Thanks

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Old 09-08-2009, 09:49 PM   #2
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Need advice on two adjoining bathroom fans


Venting through a sidewall is ok as long as the exhaust is 7' above a sidewalk of the exhaust does not exhaust into an area such as a patio, common area or such

If you are venting to a side yard you should be ok

Use a dryer vent as a termination to the exterior

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Old 09-08-2009, 10:09 PM   #3
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Need advice on two adjoining bathroom fans


Quote:
Originally Posted by Plumber101 View Post
Venting through a sidewall is ok as long as the exhaust is 7' above a sidewalk of the exhaust does not exhaust into an area such as a patio, common area or such

If you are venting to a side yard you should be ok

Use a dryer vent as a termination to the exterior
Thank you! This is on the 2nd floor, so no sidewalk nearby.

The 1st bathroom duct would be 4ft to the wall, the 2nd would be 10ft. If I can't find an inline fan locally, I'm leaning towards 2 NuTone fans, with ducts running parallel towards the wall, and having 2 dry-type exhaust fans.
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