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Old 11-13-2009, 09:04 AM   #16
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Snow in through Bathroom Exhaust Vents


I wish you guys would have chimed into my thread. Too late now.
Bathroom Fan, or not?

Part of the problem is how long you leave the vent on. You most likely keep the vent on long enough to clear the room but you have to give it time to clear the pipe also. If I understand correctly you calculate your CFM and find out how long it takes to exchange the air in the room 8 times and then double that time. I'm a total novice at this but that is what I read.

BTW Mike, I live in Kane County too.
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Old 11-13-2009, 05:44 PM   #17
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Snow in through Bathroom Exhaust Vents


Well howdy', I like timers on the vent fans. Most people turn the fan off when they leave the room--Best to let it run for a few minutes.

I'm just north of St.Charles,Il.---Mike---
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Old 11-13-2009, 06:17 PM   #18
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Snow in through Bathroom Exhaust Vents


I'm just off Randall and RT20.

I tried to find a timer to install in my bathroom. the problem is I have two switches and it would take a major modification to do it. It just isn't worth it. Not to mention that those timers are expensive.
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Old 11-14-2009, 06:08 PM   #19
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Snow in through Bathroom Exhaust Vents


I'm 400 feet east of the Fox river just south of Gilbert rd.

To bad the wiring set would make time install so much work. The switches are PRICY.

Last edited by oh'mike; 11-14-2009 at 07:15 PM.
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Old 11-22-2009, 05:29 PM   #20
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Snow in through Bathroom Exhaust Vents


Install this type of exaust cover (and install it as it should be: Layered underneath the shingles):

http://www.iaqsource.com/product.php...product=171083

This unit us not open to the elements. It has an interior collar, that protrudes up on the inside of the cover. So this keeps water and snow out.
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Old 12-19-2009, 04:06 PM   #21
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Snow in through Bathroom Exhaust Vents


Thanks to all for the advice and observations. After considering a number of options, we decided on a contractor's suggestion to reroute the troublesome bathroom vents to soffit exits on the back side of the house. The work was done about four weeks ago. We had a small amount of water dripping just prior to the "fix" and none since. I also replace the conventional manual fan switches with timed switches that permit the fans to remain operational longer without being forgotten "on" for long periods of time. It's hard to determine which of these two variables (1. soffits fan exits, 2. switch timers) made the difference but after some snow, wind, and very cold weather - we have had no further moisture dripping from the fans and the CFM exchange appears to remain as it was under the original installation. Cost: $375. Hopefully, this case is closed.
The original roof vents remain on the roof - blocked. Next spring we will remove the old vents and patch the roof.
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Snow in through Bathroom Exhaust Vents-ventcover.jpg   Snow in through Bathroom Exhaust Vents-switch.jpg  
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Old 12-19-2009, 04:46 PM   #22
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Snow in through Bathroom Exhaust Vents


You are not supposed to exhaust the bathroom vents into the soffit area
The moist air will rise up into the vents in the soffit & into the roof decking
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Old 12-19-2009, 04:51 PM   #23
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Snow in through Bathroom Exhaust Vents


I hear thats true dave but I gotta say those look really sharp and I hate making holes in a roof
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Old 12-19-2009, 05:00 PM   #24
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I saw that too Scuba. There's bound to be some moisture sucked back into the soffits that is going to cause mold and mildew. I believe this is against code in quite a few areas now. I think a Panasonic fan with some decent spring loaded roof vents was the solution needed.
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Old 12-19-2009, 05:14 PM   #25
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Snow in through Bathroom Exhaust Vents


I don't know what they are called - I just used to order them through a local sheet-metal shop - but I did manage to find a picture of one: snow and water infiltration resistant roof termination....



- http://www.askthebuilder.com/546_Bathroom_Fan_Ventilation.shtm
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Last edited by Michael Thomas; 12-19-2009 at 07:04 PM.
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Old 12-19-2009, 08:59 PM   #26
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Snow in through Bathroom Exhaust Vents


Hey, Red, looks good! Proof is in the pudding. I have no problem with mine either. Nothing to get ripped off by sliding snow!
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Old 12-19-2009, 10:03 PM   #27
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Snow in through Bathroom Exhaust Vents


May as well just routed them up to the roof vents. Would have saved alot of time and money, but that's what ya get when you get a contractor through a job-lead website I guess. Looks like decent work, but not really correct.
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Old 12-21-2009, 01:01 PM   #28
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Snow in through Bathroom Exhaust Vents


A very sharp looking installation.

Unfortunately, I agree with many others in that in the long run this will create some different issues.

I was watching some home improvement show recently (maybe it was Ask this Old House) where a vent went through the soffit. The moist air was finding it's way back into the attic and there was mold issues on the underside of the roof sheeting.
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Old 12-31-2009, 11:20 AM   #29
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Snow in through Bathroom Exhaust Vents


Quote:
Originally Posted by RedRiver View Post
We live in a three-year-old home in Fargo, ND. We have four bathroom exhaust fans that vent through our roof. Each of them, to some degree, "chatter" and clatter when the wind blows. Even more of a problem is that snow blows in during periods of heavy snow/wind, eventually blocking the duct and/or fan itself. This does not appear to be condensation building up on an inadequately insulated duct. The ducts appear to be properly insulated and installed. When I remove the interior fan cover, one can readily see snow packed in around the fan which ultimately melts and drips down in the bathrooms and damages the ceiling sheetrock. Is my theory of snow infiltration rationale? Does anyone have a recommended solution? Can one purchase some sort of roof vent cover that provides some resistance to opening so it isn't so easily and improperly opened by wind?
I really never liked the roof vent bathroom fan, especially in snow the counrty of Northern States. Keep the roof cleared from snow and ice or vent on the gable ends.
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Old 12-31-2009, 01:01 PM   #30
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Snow in through Bathroom Exhaust Vents


“Another common, but unsatisfactory practice, allowing heat to enter the attic, involves installing the bathroom exhaust vent duct into the soffit vents, rather than correctly installing this duct to an outlet vent. Soffit vents are inlet vents, not outlet vents! Everything that exits the house at a soffit vent immediately re-enters the house in the attic space, because that is what soffit vents do, they bring in outside air flow. Not only will this add heat, but it will also add humidity and moisture to the attic, defeating the very reason for installing the bathroom fan in the first place. This is a Real Problem! Even a home with functional attic ventilation can now develop molds on the roof sheathing cavities above these unsatisfactory ducts.”--------
http://www.ronhungarter.com/roofing_ventilation.html


Be safe, Gary
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