Home clothes dryer vent lets cold in

Hi,
Our clothes dryer vent has a recommended outside louvered cover, the type with 4 horizontal flaps. The louvers are clear, close properly, and work well. The pipe from the dryer to the wall is only 6" long. The exterior cover is well caulked underneath, and the inside of the vent opening is well sealed.
In the winter (now!) the cold air still enters the dryer when it's not in use, and the cold radiates from the dryer sides and bottom. Is there anything I can do to stop the cold from entering? Other than installing an open/close "valve" on the vent, which is not feasible and would be dangerous, I can think of nothing.
Thanks,
Dougie
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Try one of the inside/outside valves. When the flap is switched so the drier vents inside, it will block incoming air. Once some lint builds up, it may seal even better.
Come to think of it, lint buildup may be preventing the louvers closing all the way. Have you cleaned it lately.
A longer vent pipe that loops up and back down will form a sort of trap for the cold air (like an upsidedown P trap). If your drier vent opening is lower than the wall vent, cold air will fall into the drier.
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change the vent to the type with a one -way check flap, if installed correctly, it won't open when the wind blows.

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Thanks to all who offered suggestions. I didn't realize there were so many solutions. :-) The situation is easily solvable.
Dugie

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Dugie wrote:

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I got a type of outside vent, that has a big plactic float that drops dowm to seal automaticly, its not perfect but it is the best I could find.
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I just installed one of these dryer vents on a clients kitchen exhaust. 6" vent on a huge overhead exhaust hood. She was stuffing rags in the flapper that was there originally because these was an actual wind that would come out of the vent. When she wanted to use the hood she had to run outside and remove the rags. I found these on the net. At first I was skeptical but the more I looked at it and thought about it I had one of those "why didn't I think of this" moments. http://www.batticdoor.com/dryerventseal.html It works very well. Not a hint of a draft. We ordered two and the next one goes on her dryer. Richard
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Yes Spudnutty, that is what I have the Baticdoor, it works, it must be cleaned of lint once in a while and painted if sun hits it or the plastic will deteriorate. But it is the only thing I saw , its design seals out drafts, but a bit of cold air comes in through convection of the plastic. Mine is 3 years old. got it a Menards.
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snipped-for-privacy@lycos.com wrote:

Hey, this thing looks good. Does anyone know if a similar thing is available for a 3 1/4 x 10 rectangular duct that comes out of our kitchen exhaust vent? I can't easily change that to any other ducting configuration.
Ken
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We don't have a laundry room. :-( Too bad - It would make a great cold room for veggies, wine and beer.
Dugie

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that prevents the louvers from closing completely. Every once in a while I have to take a sharp point and dig the lint out of the hinge points to stop the cold air from getting into the dryer. MLD
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<snip>

Thanks, but I've done that, and do it frequently.
Dugie
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Wouldn't a single flapper for the outside vent seal better than those multiple slats?
Unless you have a high efficiency furnace/boiler with outside air supply, did you ever think that maybe your heating system is not getting enough air and is sucking it in through the dryer vent?
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