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Old 01-16-2019, 10:36 AM   #1
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Bathroom Fan Location


We are getting ready to gut our main bath and reconfigure. This is a rambler house with attic above. Problem is I have a low sloped roof and can not get into the attic in this section. The current fan has an unwrapped pipe that discharges near a roof vent in the attic.


I was thinking of having a wall fan that will drop down into the open basement and exit through the rim joist. The rim joist is close to the ground, but our house has 4 foot overhangs and snow covering it isn't an issue.


A little demo i did last night leads me to believe that there is no ceiling/drywall above the bathroom soffits. We are going to tear the soffits out and restore to the whole bathroom to normal ceiling height, so i may have ceiling access close to where the fan should be. Still, it will be a short 2 foot run to the roof.


MY QUESTION IS: Would you run a ceiling fan out the roof with only a two foot venting run in Minnesota, or run a wall fan out through the basement?



Thanks for looking.


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Old 01-16-2019, 12:07 PM   #2
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Re: Bathroom Fan Location


If you can figure out a way to reasonably seal the connection between the vent and the stub out of the fan, I would rather just vent straight out the roof rather than dealing with the rim joist.

Pics would help.
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Old 01-16-2019, 12:14 PM   #3
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Re: Bathroom Fan Location


Is the bathroom on an exterior wall? Can you vent the fan horizontally?
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Old 01-16-2019, 01:05 PM   #4
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Re: Bathroom Fan Location


It is on an exterior wall, but the tub is going to be wall to wall in the five foot wide bathroom. Plus I believe that would be more energy inefficient (read cold) than a two foot run in the ceiling.


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Old 01-16-2019, 01:48 PM   #5
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Re: Bathroom Fan Location


I would go up thru the roof, with a damper at the fan and the roof vent you don't loose a lot of air.
Soffit exits can add moisture to the attic and going down and out would need at least 2 90s so your duct would be acting like it was 20 ft long or more.
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Old 01-16-2019, 01:53 PM   #6
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Re: Bathroom Fan Location


No soffit. Thru basement and rim joist.


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Old 01-16-2019, 02:07 PM   #7
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Re: Bathroom Fan Location


Quote:
Originally Posted by Beepster View Post
No soffit. Thru basement and rim joist.


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So where would you put the fan, ceiling, high on wall. down the wall and under the floor? Cold zones around the duct, wall and floor, ceiling downstairs?
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Old 01-16-2019, 02:27 PM   #8
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Re: Bathroom Fan Location


High on the wall, vent down through the wall, and run between the floor joists to the rim joist. The fan would be 4-5 feet from the outer wall.


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Old 01-16-2019, 03:33 PM   #9
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Re: Bathroom Fan Location


Quote:
Originally Posted by Beepster View Post
High on the wall, vent down through the wall, and run between the floor joists to the rim joist. The fan would be 4-5 feet from the outer wall.


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Run the exhaust through the roof !
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Old 01-18-2019, 02:51 PM   #10
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Re: Bathroom Fan Location


If there's so little space that you can't work in the attic, then you should be able to cut a hole in the roof and simply reach in from the top. Sounds easy to me (but then I'm not there ).
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Old 01-24-2019, 01:29 AM   #11
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Re: Bathroom Fan Location


Check the fan manufacturers requirements as to run length with a horizontal run. If the duct can run parallel to the attic floor joists then you can run it to the exterior wall and vent it to the outside.
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