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Old 01-13-2009, 08:50 PM   #1
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Dryer Vent Condensation


My dryer vent is about 8 ft long and is piped out a window. I just replaced the plastic type of duct with a flexible alum. duct. I just noticed that the top of the duct where the pipe comes in is very cold and there is quite a bit of condensation on it.

I have some insulation made for duct work left over from venting my bathroom exhaust fan. Would it hurt to wrap this around the pipe? I am wondering because it probably would get qute hot when the dryer is running.

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Old 01-13-2009, 11:17 PM   #2
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Dryer Vent Condensation


If your existing duct is aluminum, then it'll take the heat.

You might consider replacing that duct in future with a 4 or even 6 inch "B" vent. These are insulated vents pipes, and they'd probably work a lot better than just wrapping insulation around your flexible aluminum duct.

Besides, typically on a dryer the regular and permanent press thermostat is 165 deg. F, while the delicates thermostat is 140 deg. F. 165 deg. F air is hot to the touch, but it's never gonna start a fire. You need both the thermostat and the high limit to fail before there'd be any concern about anything becoming too hot.

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Last edited by Nestor_Kelebay; 01-13-2009 at 11:28 PM.
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Old 01-27-2009, 03:14 PM   #3
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Dryer Vent Condensation


Kind of bumping an old thread.

Is it safe then to spray foam insulation around the gaps of the pipe? Where the pipe and meets the duct and where the pipe and duct go out the window to the backyard?

I notice I have condesantion between the two windows and am trying to stop it.
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Old 01-28-2009, 07:26 AM   #4
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Dryer Vent Condensation


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Originally Posted by Woody10 View Post
Kind of bumping an old thread.

Is it safe then to spray foam insulation around the gaps of the pipe? Where the pipe and meets the duct and where the pipe and duct go out the window to the backyard?

I notice I have condesantion between the two windows and am trying to stop it.
I would tape any open seams with metal tape. You can foam the areas that go outside or use a foamboard to surround the duct for a cleaner install.
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