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Anyone know where I can get some flexible hose that’s smooth on the inside? I need it to vent a bathroom fan to the outside. It’s a fairly long run to the outside wall (can’t/don’t want to go through the roof), so I think the regular flexible vent hose (like the ones for dryers) would be too much for the fan motor to efficiently exhaust the shower humidity. I could use regular PVC, but the geometry of the run would make it very tricky to get right. I checked at my local shop, and the nearby HD, and was met with blank stares & shaking heads.
As for background info, the length of the run is 17′, through an attic, and I’m in the Northeast.
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Big bucks,but these people have some relatively smooth bore flexible ducting. They have all sorts of interesting stuff. http://www.aircraft-spruce.com/main.html Joe H
*I am not sure why you need a "smoothbore" pipe for your application. How about the type of heavy duty, flexible hose that is used in shop and industrial applications to attach sawdust creating machinery to the dust collection ducts? These are wire reinforced, "rubberized", pleated hoses that come in a variety of diameters and hold up to very heavy use. For an example of some types see:http://www.blowpipe.com/catalog1.html
*Thanks Casey!I think this is exactly what I was looking for. I'm going to call them to get some details on the hoses.The reason I'm looking for tubing with a relatively smooth interior has to do with ease of airflow. Air flowing through a pipe with internal "ridges" (like a dryer exhaust hose) creates turbulence at each ridge, which impedes the effeciency of the airflow. A smooth surface does not. For a powerful fan motor (like a dust-collection unit), turbulence isn't going to be a huge problem. For a small bathroom exhaust fan, however, pushing the air through a long run of turbulence-inducing hose could decrease it's airflow capacity, which would reduce it's ability to vent the bathroom properly.