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State: North Dakota
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venting celing bathroom fan
[#2] Posted: 05/19/2004 - 2:41:16 PM |  |  |
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You can vent through the soffit, but with the WI climate I'd be more inclined to recommend venting through the roof. The warm moist air wants to rise. So even though it's discharged to the outdoors below the soffit, it will want to rise towards the soffit again....especially in the winter time. If it were my house, I'd go with the vent through the roof.
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Austin, Texas
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 venting celing bathroom fan
[#3] Posted: 05/19/2004 - 3:09:51 PM | | |
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Here are a couple reasons not to exhaust the bath fans through the soffit. These were taken by some of our brethren.
Download Attachment:  BathFanSoffit2.JPG
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Download Attachment: BathFanSoffit1.JPG
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Paul in Austin
www.newdayinspections.com |
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venting celing bathroom fan
[#4] Posted: 05/19/2004 - 6:04:32 PM | | |
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Good solid advice.
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venting celing bathroom fan
[#5] Posted: 05/24/2004 - 09:50:24 AM | | |
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 But what about special soffit exhoust vents? I bought one this weekend that claims to let warm air out, but shuts when the fan is not blowing? Is that acceptable? Also, i have been warned about roof installations because apparently, if you do not patch the roof perfectly, it will certainly leak. The last Alternative is to run a good 15 ft long tube along the roof line in the attic, and run it to the wall at the back of the house. Then a wall vent can be used.
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Kenmore, WA
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venting celing bathroom fan
[#6] Posted: 05/24/2004 - 10:09:33 AM | | |
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Hi,
I've never seen anything but trouble with soffit venting. When properly installed a rain cap designed specifically to vent a bath fan through the plane of the roof will not leak. There is no need to "patch" the roof perfectly, because the cap flange is integrated into the roof shingles. They are even used on shake roofs around here and don't leak despite the uneven surface.
Whoever is telling you that, should go to his proctologist and get his head freed up.
ONE TEAM - ONE FIGHT!!!
Mike
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venting celing bathroom fan
[#7] Posted: 05/24/2004 - 10:20:33 AM | | |
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 What about running it along the floor of the attic to the wall at the back of the house? Is it bad to run the ducting about 15-18 feet?
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Kenmore, WA
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venting celing bathroom fan
[#8] Posted: 05/24/2004 - 11:08:21 AM | | |
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Hi,
You can do that. Except, you need to insulate the duct so air won't cool to dewpoint and condense inside, you should not use corrugated ducting and the duct needs to not have any dips in it that could end up pooling water.
You also need to be careful about what's directly overhead. I've never personally seen vents that exhaust out the side of a house cause any attic issues, but others who've posted here have posted pictures of some serious moisture-related issues involving vents that discharge outside of sidewalls beneath the eaves.
OT - OF!!!
M.
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Chicago, IL
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venting celing bathroom fan
[#10] Posted: 05/24/2004 - 11:28:14 AM | | |
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However, we plan on finishing the attic to become livable space. This has been the most difficult project ever, and it seems like every option sucks. :(
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Adrian, Missouri
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Chicago, IL
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venting celing bathroom fan
[#12] Posted: 05/24/2004 - 9:47:28 PM | | |
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Other option.....
Get an inline Fantech fan going on; they have a bathroom/water closet fan that moves around 800cfm minus static. You mount the fan @ the outlet anywhere (more or less) that you want (up, down, sideways), & pull the bath air out silently. One fan can service multiple bathrooms.
http://www.fantech.net/bathroom.htm
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Kurt in Chicago
"If I smell it, it goes in the report".............Phillip Smith...2012
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Adrian, Missouri
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venting celing bathroom fan
[#13] Posted: 05/25/2004 - 06:26:48 AM | | |
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Quote: Originally posted by kurtOther option..... Get an inline Fantech fan going on; they have a bathroom/water closet fan that moves around 800cfm minus static. You mount the fan @ the outlet anywhere (more or less) that you want (up, down, sideways), & pull the bath air out silently. One fan can service multiple bathrooms. http://www.fantech.net/bathroom.htm
Very cool!
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venting celing bathroom fan
[#14] Posted: 05/25/2004 - 07:24:05 AM | | |
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Good stuff Kurt, great tip.
Weird cat...make sure that you get plenty of ventilation (a power vent makes a lot of sense here) in the little bit of attic space (if any) you have left or in each and every rafter bay. I would definitely recommend a low intake and high exhaust whether by ridge vent or power actuated. It's gonna be hot up there.
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Montgomery, TX
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venting celing bathroom fan
[#15] Posted: 10/17/2007 - 04:36:48 AM | | |
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Bathroom venting
IRC M1501.1 Outdoor discharge. the air removed by every mechanical exhaust system shall be discharged to the outdoors. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
The code the code
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Corpus Christi, TX
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venting celing bathroom fan
[#16] Posted: 10/17/2007 - 08:47:43 AM | | |
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Curious
M1506.2 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.
Underlining and bold are mine.
IRC M1501.1 Outdoor discharge. the air removed by every mechanical exhaust system shall be discharged to the outdoors. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
1501.1 says air shall not be exhausted into a soffit.. Does that mean a soffit or thru a soffit vent opening?
If the subject question involved a back flow damper, it seems it would be acceptable based on 1506.2. I keep hearing about icing of condensation at soffit vents - we don't have that problem here.
How come the code people keep changing the numbers?? In 2003 edition 1501.1 was for clothes dryers exhaust.
Inserted quotes are 2006.
Dammit! I just noticed this thread started over 3 years ago...Oh well.
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Elizabethtown, PA
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venting celing bathroom fan
[#17] Posted: 10/18/2007 - 07:02:47 AM | | |
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Doesn't the new 2006 IRC require bathroom vents (such as this) to actually vent outside and does not allow these to vent just at the soffit? In other words, instead of the vent terminating just inside the soffit, I believe the new 2006 IRC requires the vent to terminate PAST the soffit (literally now outside) to prevent mold growth on roof sheathing, etc.
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Matthew Steger
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BathFanSoffit2.JPG
BathFanSoffit1.JPG
