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Old 01-30-2012, 10:57 PM   #1
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Aluminum or vinyl bathroom vent hose


For a bathroom fan, is one preferable to the other? I live in Arkansas so the climate is generally pretty warm. The bathroom is tiny, like 60SF. The run will be no more then 9 feet.

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Old 01-30-2012, 11:00 PM   #2
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Aluminum or vinyl bathroom vent hose


Both will work fine.

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Old 01-31-2012, 04:41 AM   #3
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Aluminum or vinyl bathroom vent hose


As joecaption stated, both are fine for a bath fan. Solid pipe is still better. Plastic should never be used for a dryer run, but fine for bath vents.
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Old 01-31-2012, 07:09 AM   #4
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Aluminum or vinyl bathroom vent hose


What Bob said, rigid pipe is smooth and has no places to cause turbulence so air flows smoother.
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Old 01-31-2012, 07:26 PM   #5
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Aluminum or vinyl bathroom vent hose


I'm going to go with a flexible vinyl for a couple of reasons. First the run is really short and the flexible will be easier for a novice like me to work with. Second, the idiots who built this house never vented the bathroom. When I started renovating the bathroom I pulled the fan out and it doesn't go anywhere. I got up in the attic and there is no venting for the fan whatsoever. For forty years without being vented I was shocked to find very little molding around the insulation. The bathroom is small, and I guess that is the main reason there isn't molding.

My house has a couple of Whirlybirds in the roof. Would it be acceptable to just run the vent up to it and secure it? I know it isn't the proper way to vent, but I really don't want to mess with the roof and there isn't a way to vent out a wall. I would think that venting it at all would be better than the way it was before.

What do you think?

Last edited by Michaelpro; 01-31-2012 at 09:36 PM.
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Old 01-31-2012, 11:44 PM   #6
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Aluminum or vinyl bathroom vent hose


I would never run it to a whirlybird. Out the gable, if there is one: Another bathroom exhaust vent question

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Old 02-01-2012, 12:23 AM   #7
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Aluminum or vinyl bathroom vent hose


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Originally Posted by GBR in WA View Post
I would never run it to a whirlybird. Out the gable, if there is one: Another bathroom exhaust vent question

Gary
Alas I have a hip roof so no gables for me. I might possibly be able to run it to the vents that come out under the eves of the house, but that would entail some serious crawling haha.

If you don't mind me asking, why wouldn't you run it up to a whirlybird?

Thanks for your suggestions!
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Old 02-01-2012, 02:28 AM   #8
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Aluminum or vinyl bathroom vent hose


IMO I think the whirlybird would be trying to suck air out of your bathroom...on extra windy days it would probably make your damper rattle. That would be annoying.
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Old 02-01-2012, 09:35 PM   #9
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Pete said it! You would also be blowing wet air against the fan turbine when it wasn't windy enough to turn it, a little extra water there to give rust if any nicks or screws not galvanized enough. Could freeze locking the turbine until warmer weather, depends on climate.

Vent to the soffit and some moist air will come back and mold the attic framing- that is the location of the attic intakes- remember.

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Old 02-02-2012, 02:03 PM   #10
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Aluminum or vinyl bathroom vent hose


Thanks guys.

You have a good point about the whirlybird sucking from the vent all of the time. I didn't think about that. Since I don't have the experience to vent through the roof I am going to vent to the vicinity of the whirlybird....for now. I'll do it properly in the near future.

Considering it was never vented in the first place I think this will still be better.

There was also no mold, which is strange. Maybe the vent didn't work in the first place haha.
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Old 02-02-2012, 10:14 PM   #11
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Aluminum or vinyl bathroom vent hose


Venting through the roof is probably your best option. I know that sounds daunting but, with a little research you could probably do it. Failing that, maybe hire a pro to put the roof vent where you want it.

Your next best option is throught the side wall if you have an exterior wall in your bathroom. Venting out the eve vent is a bad plan. People do it but those are designed to draw air in and up through, in your case, the whirlybirds.

The lack of mold in your attic suggests that the moisture was being adaquately vented out before but it is still not the recommended way. Bathroom ventillation becomes more of a concern if you have people in the house that like to take long showers like teenagers.
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Old 02-05-2012, 11:49 AM   #12
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Aluminum or vinyl bathroom vent hose


Since we're on venting to the roof, I have a question I've always wondered about and one that might help Michael when he puts a roof vent in (not sure how cold it gets in AR).

When the warm moist air goes up the pipe to the roof vent in the winter, what stops condensation from forming and running back down to the fan?

Can you put enough insulation wrap around it to prevent condensation in northern climates?

Last edited by pete0403; 02-05-2012 at 11:51 AM.
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Old 02-05-2012, 01:59 PM   #13
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Aluminum or vinyl bathroom vent hose


Quote:
Originally Posted by pete0403 View Post
Since we're on venting to the roof, I have a question I've always wondered about and one that might help Michael when he puts a roof vent in (not sure how cold it gets in AR).

When the warm moist air goes up the pipe to the roof vent in the winter, what stops condensation from forming and running back down to the fan?

Can you put enough insulation wrap around it to prevent condensation in northern climates?
I was wondering the same thing. I would think that if the pipe was rigid enough and the flow was fast enough you wouldn't really have to worry about it.
Something vinyl like I used would also conduct heat and cold less than aluminum. The temperature difference would be so dramatic that material type probably doesn't matter anyways.
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Old 02-06-2012, 08:25 PM   #14
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Aluminum or vinyl bathroom vent hose


I have all vinyl parts to my roof vent. No condensation problems but you do have to kep the snow from covering it up in winter.

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