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I have some advice that everyone should follow when installing a bathroom fan…Don’t EVER use plastic flex tubing to vent a bath fan. Not only will you run into the problems noted above, but the material itself will quickly deteriorate and eventually break and then you will have to start climbing around your attic or some other nasty place to try and repair it.
Use aluminum duct or solid plastic as Barry mentioned and insulate it or better yet, bury it in about a foot of insulation. Also make sure the tube is pitched toward the outside of the house if it is a horizontal vent.
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I recently added a simple fan to the bathroom. I vented it with plastic flex tubing about 10' to the gable end. Tonight for the fun of it I checked for air flow, and there was none. I climbed in the attic and found at least 2 gallons of water in the tube. I suspect a sag in the tubing iced up, then all the moist air behind it continued to dump moisture. I fould it absolutely amazing the incredible quantity of water dumping out of the end of the vent, not to mention the water that fell back into the bathroom. It is hard to imagine how much moisture that would be in the house without that fan.
*Montana,That happens all the time around here and nobody knows it. The key is to put the vent line under your insulation to keep it warm. or... even better,vent using a "thru wall, no tubing" install and bestof all, I would use "my system" that I can't talk about...Bamboo my fingernails and I'm still not telling,Jack : )
*Will it take bamboo to tell me how you get these funky colors?Where's "around here"? I'm in Lakeside, Montana
*Montana,Follow this link...(" AdirondackJack "Redirection. . . . if your interested." 2/27/99 11:26pm) by clicking on it and you'll be brought to another on going topic related to yourquest....Politely and in fun, fangless,Jack : ) )(
*Oh my! AJ actually UNWILLING to talk. ;)I put a fiberglass sleeve over my bath vent duct and will eventually bury it in cellulose. I hope this works... There is a big difference in the amount of water carried by hot air and cold! When I was in school, i used to cross a bridge over a small stream a lot in winter -- my breath only fogged over the stream...
*Speaking of venting bathrooms--anyone had any experience with the device advertised in Fine Homebuilding that is supposed to vent all bathrooms through a single vent? Looks to be a plenum with fan that sits in the attic.
*I'm using four inch PVC drain pipe to vent my bath fan, and I've had no water problems. The pipe is in open air in the attic and is wrapped with foil faced fg insulation. The foil is there because that's how the stuff came from the store. Location is western Wisconsin, warm at 25 degrees today.
*I have some advice that everyone should follow when installing a bathroom fan...Don't EVER use plastic flex tubing to vent a bath fan. Not only will you run into the problems noted above, but the material itself will quickly deteriorate and eventually break and then you will have to start climbing around your attic or some other nasty place to try and repair it.Use aluminum duct or solid plastic as Barry mentioned and insulate it or better yet, bury it in about a foot of insulation. Also make sure the tube is pitched toward the outside of the house if it is a horizontal vent.