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Old 01-18-2012, 01:05 PM   #16
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Bathroom Exhaust Vent


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Originally Posted by 4just1don View Post
mae-ling., so your mounting it on the vertical wall towards the top of exterior wall?? why exit so low then? seems it would reduce exterior wall insulation

If your using ceiling mount how do you get vent down thru top double plate to get to stud cavity and seems same question on why down to floor joists?
Sorry if I was not clear. Mount in on an interior wall at the top of the wall. then down the interior wall turn it and out between the floor joists. Insulate well around it where it goes between the floor joists and out the wall.

If you are running it perpendicular to floor joists you would have to run it out a basement wall.

This is so cold air can not come down it and in or wind, as in a roof or straight out a wall installation.
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Old 01-18-2012, 07:24 PM   #17
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Bathroom Exhaust Vent


my house has the soffit vent but how do you connect it? or do you just run the vent to it? no connection?
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Old 01-18-2012, 08:37 PM   #18
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Bathroom Exhaust Vent


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Originally Posted by Minus08 View Post
It flaps because of the low pressure area created on the outside of the damper by the high winds. The same way a plane's wing creates lift.
Exacty! Winds coming across the roof peak, especially, create a low pressure area.. Exactly why you must run chimneys up high enough to get outside the venturi/aerodynamic zone.

Another good approach, if you have a peaked roof and attic with gable, is put in a vent (dryer type) in that wall up near/at the peak and under the eave. Multiple vents? Run them together into a single aluminum vent pipe and out through that one exit point. (Even saves the heat - less moisture - for your attic!)
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Old 01-18-2012, 09:54 PM   #19
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Bathroom Exhaust Vent


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my house has the soffit vent but how do you connect it? or do you just run the vent to it? no connection?
You probably should terminate the duct into a vent like below. The easy way is to just terminate the duct into the soffit cavity. Probably not the right way. better to use a vent.

http://www.google.com/products/catal...d=0CI0BEPMCMAY
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Old 01-18-2012, 10:02 PM   #20
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Bathroom Exhaust Vent


Heres another termination vent from Home Depot:

http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053


and another from Lowes:

http://www.lowes.com/pd_317949-85334...ent&facetInfo=
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Old 01-19-2012, 05:08 AM   #21
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Bathroom Exhaust Vent


wow - thanks - I didn't know they made soffit vents

So it sounds like I would 90 up from the fan, lay it on the ceiling joist and then 90 back down to these vents, with metal pipe? I assume I should also insulate the pipe? Or could I use like a flex duct that has insulation?
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Old 01-24-2012, 01:55 PM   #22
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Bathroom Exhaust Vent


For those who make the point that soffit-vented moisture can travel back up into the attic ....

This is true, so for that reason, I blocked up the soffit 3 feet either side of the vent. I figured this should help quite a bit.
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Old 01-24-2012, 02:13 PM   #23
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Bathroom Exhaust Vent


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For those who make the point that soffit-vented moisture can travel back up into the attic ....

This is true, so for that reason, I blocked up the soffit 3 feet either side of the vent. I figured this should help quite a bit.

Good idea.

Probably not going to affect overall attic ventilation by losing 6 sq.feet of soffit venting.

Beats the alternative of having that moisture come back up in attic, condense on framing members and start a mold issue.
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