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Old 03-15-2009, 07:27 PM   #1
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Where to vent bath fan


Adding a 2nd fan to bath inside the shower.stand up shower all enclosed.. the toilet is in a seperate room with a fan. My home inspector advised adding a fan inside the shower.......... i can vent a few ways not sure which one is the best way..I can go straight up about 3' and do a roof vent, or cut a hole in the plywood to access open area where the porch is which is covered by the roof as well... i would add a vent in vinyl facing downwards to porch

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Old 03-15-2009, 07:58 PM   #2
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Where to vent bath fan


If you are confident in your roofing skills, go up.

Note: If you live in a really windy area, the wind will want to come in thru the vent and make it rattle. The proper type of roof vent will help. I made this mistake in my cabin by using a standard T top vent and it noisy as heck when the wind kicks up.

Go thru the wall if it's easier and lands in an acceptable place.

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Old 03-15-2009, 08:16 PM   #3
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Originally Posted by 220/221 View Post
If you are confident in your roofing skills, go up.

Note: If you live in a really windy area, the wind will want to come in thru the vent and make it rattle. The proper type of roof vent will help. I made this mistake in my cabin by using a standard T top vent and it noisy as heck when the wind kicks up.

Go thru the wall if it's easier and lands in an acceptable place.
very windy on a hill and about 15 acres behind me open.. always a breeze here...... roofing skills never done anything... caulked around roof vents to fix a few leaks is about it ... was going to drill hole then saw zaw away

how about something similar to this?

http://plumbing.hardwarestore.com/51...ign=googlebase
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Old 03-15-2009, 08:33 PM   #4
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Where to vent bath fan


That will work as long as the prevailing winds don't blow directly into the opening.

If you penetrate the roof, it will leak. Vent it out thru the wall
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Old 03-15-2009, 08:39 PM   #5
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That will work as long as the prevailing winds don't blow directly into the opening.

If you penetrate the roof, it will leak. Vent it out thru the wall
so put a hole in vinyl and face down towards porch?
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Old 03-15-2009, 08:42 PM   #6
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Where to vent bath fan


That will work.....and the roof won't leak.
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Old 03-15-2009, 09:33 PM   #7
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That will work.....and the roof won't leak.
sounds good thanks for the input!
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Old 03-16-2009, 02:38 PM   #8
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Where to vent bath fan


The roof mount exhaust is 5-10% more efficient at removing warm, moist air (hot air rises) than a side mount one. Roof terminal should have a pipe neck attached for a positive connection. Use straight pipe (metal or PVC) whenever possible, wrapped with insulation. Corrugated, flex, pipe creates turbulence and has almost double the surface area for water exhausted in baths to collect on. Use as few bends as possible, and 45s* instead of 90s*. Tape metal joints with silver tape, not duct tape (4 year life). Use hose clamps or similar, and a screw on topside of metal joints. Use HVAC black tape for plastic covered insulation. Insulate the whole pipe and the fan box. Use caulk to seal the small gaps at the fan to wallboard joint. Let no heated moist air into the attic which would cause mold, mildew, wet other insulation (defeating its purpose), and even make frost in your attic. Be safe GBAR
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Old 03-17-2009, 01:06 PM   #9
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Where to vent bath fan


Do not have it exhaust outside near roof soffit vents. You can block off nearby soffit vents if you have enough other soffit vents.

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