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Old 09-10-2008, 04:37 PM   #1
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bath fan venting


I need to install a bath fan and vent it. Installing the fan won't be a problem but i need some help with venting it. I was told the easiest way to do this is to run a flex pipe to the soffet and vent it there. Is there any problem with this? Also i looked at the big box stores and none of them have a soffet vent for this, they all have roof vents which i really don't want to tear into my shingles to do this if i don't have to. Thanks.

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Old 09-10-2008, 08:00 PM   #2
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bath fan venting


There's no "right answer" unfortunately. I'm a believer in getting the humid air out of the building whenever possible as opposed to just terminating the vent in a ventilated attic. That just dumps humidity all over the insulation.

Running it to a soffit vent is ok in my opinion. I suggest securing it to the louvers of the vent with wire ties in a downward position.

Another cool installation I've seen is when people use clothes dryer vent terminations in a downward position in the soffit. The plastic damper flap is removed from the dryer vent because the bath fan very likely won't have enough static pressure to push it open. I'd suggest installing some insect screen.

Also, there's no reason you can't use a roof vent kit intended for bath fans in a downward position in the soffit.

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Old 09-10-2008, 09:51 PM   #3
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bath fan venting


They make soffit caps,



but the thing is, if you have a soffit vent for the roof, I think it needs to be blocked off for so many ft. on either side of the vent?
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Old 09-10-2008, 10:00 PM   #4
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bath fan venting


Lambro makes an eave vent cap, model 142:

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Old 09-10-2008, 11:21 PM   #5
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bath fan venting


I like the vent Chris posted! That is a less-redneck version of what I described.

I don't know of any reason you'd have to block the soffit vent on either side of the bath vent termination. I guess there is a potential for the humidity to re-enter the attic through the soffit vents...But that installation beats the alternatives in my opinion.
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Old 09-11-2008, 06:05 AM   #6
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bath fan venting


Quote:
Originally Posted by thekctermite View Post
I like the vent Chris posted! That is a less-redneck version of what I described.

I don't know of any reason you'd have to block the soffit vent on either side of the bath vent termination. I guess there is a potential for the humidity to re-enter the attic through the soffit vents...But that installation beats the alternatives in my opinion.

I believe its a building code, I never actually looked it up. But yes, its so the humidity does not re-enter the attic.
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Old 09-14-2008, 01:36 AM   #7
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bath fan venting


R303.3 of the IRC covers bath vents, and doesn't get too specific about venting methods, other than to say that they must be exhausted directly to the outdoors.
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Old 09-14-2008, 06:59 AM   #8
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bath fan venting


Thanks guys. I ordered one of those vents and will go that route.
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Old 09-14-2008, 08:14 AM   #9
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Originally Posted by thekctermite View Post
R303.3 of the IRC covers bath vents, and doesn't get too specific about venting methods, other than to say that they must be exhausted directly to the outdoors.

I'll look into it also and see if I can dig up where I heard about it.

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