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Old 12-17-2010, 07:56 PM   #1
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bathroom exhaust fan code


Is it code that bathroom exhaust fans be vented outdoors? I live in East TN and I hardly ever see this done. Practically none of the houses in my subdivision have any vents from exhaust fans on their roof. I live in a split-foyer home (built in 2001) that has 2 bathrooms upstairs and 1 bathroom in the basement. None of these fans vent outside. They don't even have ductwork connected to them.

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Andy

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Old 12-17-2010, 09:05 PM   #2
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bathroom exhaust fan code


As far as I know, a bathroom exhaust fan must be vented outside. Though a roof vent isn't necessary. You can vent through the wall and use a dryer vent on the exterior, or vent through the soffit (like mine is).

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Old 12-17-2010, 09:08 PM   #3
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M1507.2 Recirculation of air. Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted directly to the outdoors. Exhaust air from bathrooms and toilet rooms shall not discharge into an attic, crawl space or other areas inside the building. http://publicecodes.citation.com/ico...007_par001.htm

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Old 12-17-2010, 09:11 PM   #4
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ok that's what I thought. How come inspectors don't catch this?
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Old 12-17-2010, 09:33 PM   #5
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Choose one;
unqualified for their position, don't care, retiring soon, don't know, it was Friday, forgot to write it, forgot their pen/pencil, was talking on the phone while inspecting, thinking of something/someone else, was upset with their boss/day, had to use the restroom soon, or I don't know!

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Old 12-18-2010, 12:05 AM   #6
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Quote:
or vent through the soffit
I disagree with that suprvee. Venting through the soffit allows the moist air drawn from the bathroom to be drawn back up through the soffit and into the attic, an unconditioned space, that in time will develop mold problems. The only way to vent a bathroom properly is through the roof.
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Old 12-18-2010, 08:13 AM   #7
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M1507.1 General. Where toilet rooms and bathrooms are mechanically ventilated, the ventilation equipment shall be installed in accordance with this section. http://publicecodes.citation.com/ico..._15_sec007.htm

GBR, I read this as "if you vent the bathroom, it must be to the outdoor". Further north, houses are tight (at least they are supposed to be), and I need a second switch on my main floor, so I can turn on my bathroom fan for house ventilation. But in TN, I am not so sure that is the case.
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Old 12-18-2010, 09:04 AM   #8
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Originally Posted by VIPlumber View Post
I disagree with that suprvee. Venting through the soffit allows the moist air drawn from the bathroom to be drawn back up through the soffit and into the attic, an unconditioned space, that in time will develop mold problems. The only way to vent a bathroom properly is through the roof.
There's no reason it can't be vented out a side wall of the house, away from the soffits.
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Old 12-18-2010, 02:37 PM   #9
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When I built my cabin the inspector suggested I vent out the wall because ( he said) roof vents don't work well when you have 4 feet of snow on the roof.
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Old 12-18-2010, 03:42 PM   #10
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Regardless of where you live, if you have vent fans installed with no ductwork whatsoever, the installer was incompetent. What purpose do they serve if they are not cunducting the air to another area, at least to a ventilated attic or crawl space. Where is all that shower steam going when the fan is turned on? You would be better off not turning them on at all and opening the window or door instead.
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Old 12-20-2010, 08:46 AM   #11
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Quote:
Originally Posted by VIPlumber View Post
I disagree with that suprvee. Venting through the soffit allows the moist air drawn from the bathroom to be drawn back up through the soffit and into the attic, an unconditioned space, that in time will develop mold problems. The only way to vent a bathroom properly is through the roof.
You need to use an exhaust vent designed for soffits, they have all the required flaps and collars to prevent moist air backdrafts. I do agree that a roof vent would be a better choice. But for residential use, both setups will work fine.
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Old 12-20-2010, 05:06 PM   #12
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Quote:
Originally Posted by suprvee View Post
You need to use an exhaust vent designed for soffits, they have all the required flaps and collars to prevent moist air backdrafts. I do agree that a roof vent would be a better choice. But for residential use, both setups will work fine.
I don't think this will work. No flap and collar setup will eliminate moist air being sucked up to the attic. At least none I've seen.
Sounds like marketing hoopla.
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Old 12-23-2010, 06:27 PM   #13
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Originally Posted by Ron6519 View Post
I don't think this will work. No flap and collar setup will eliminate moist air being sucked up to the attic. At least none I've seen.
Sounds like marketing hoopla.
Ron
how does it do that,when there is a metal duct tube from fan to colar to out side?setup is just like a dryier vent.3"dia vent tube.
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Old 12-23-2010, 06:32 PM   #14
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Originally Posted by oleguy74 View Post
how does it do that,when there is a metal duct tube from fan to colar to out side?setup is just like a dryier vent.3"dia vent tube.
Sorry, I don't follow what you're saying.
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Old 12-23-2010, 06:42 PM   #15
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there is a metal flex tube/duct from fan to vent to outside air.the flapper keeps outside air from comming back into house.unless this duct comes off,no exch to attic.

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