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Old 05-09-2014, 08:02 AM   #1
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intend to run bath fan exhaust thru roof


I'm researching and "about to do" some attic insulation. I'm taking out the bath fan duct that currently runs from my bath fan to the soffit as I am reading all the reasons why I should do this and intend to run it thru the roof. This is the roof duct I intend to put in as it has "a rise" and less likely to have snow buildup blocking the exhaust.

http://www.homehardware.ca/en/rec/in...ink/R-I2670746

My attic is directly over my bedroom and bath.......My question is ... With all this work I am doing to insulate my attic won't cold air "come in" from this vent and come down into my bath (cold air falls /hot air rises). Yes it has a damper but I cant see that some little "non efficient non air sealing" damper will stop cold air from migrating its way down. Wouldn't i anticipate putting my hand in front of this bath exhaust fan (WHEN NOT RUNNING) and feeling cold air entering my bath??. Am I not now introducing a path for cold air to enter my bath?? My duct is 4 inch but this is 6 inch. I intend to attach a 6 inch to 4 inch adapter to it (any problem with that??

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Old 05-09-2014, 12:39 PM   #2
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intend to run bath fan exhaust thru roof


Can you run it through the side of the home at a gable wall?

That is the best way as you can bury the pipe in the insulation and keep it on the warm side of the wall insulation layer.

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Old 05-09-2014, 12:45 PM   #3
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intend to run bath fan exhaust thru roof


iTS ABOUT 9 FEET TO THE GABLE WALL BUT WOULD NEED A 90 DEGREE AT THE FANS EXIT (NOT RECOMMENDED BY THE MFG)..... OR TWO 45'S WHICH i COULD DO. AS OPPOSED TO 2 FEET RIGHT OUT THE SLANTED ROOF

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Old 05-09-2014, 12:50 PM   #4
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intend to run bath fan exhaust thru roof


If you go through the roof, just make sure you seal all the seams in the pipe and wrap the pipe with insulation as well as an air barrier around the insulation.
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Old 05-09-2014, 12:54 PM   #5
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intend to run bath fan exhaust thru roof


My plan was to buy insulated duct to run from the fan to the roof.. Would that be sufficient?
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Old 05-09-2014, 01:07 PM   #6
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intend to run bath fan exhaust thru roof


Should be fine.

The snow will be blown off and melted pretty quickly as well.

Go for it.
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Old 05-09-2014, 02:45 PM   #7
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intend to run bath fan exhaust thru roof


Good advice above. To answer the baffle question, there is one on the fan unit itself and another where it exits the home (roof baffle), so they are generally pretty efficient.

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