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This is a dryer and exhaust fan vent hood that I really like a lot. It's called the EcoVent
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It comes white but I've painted ours here brown using some Krylon paint. It worked really well
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I'm just going to pull it off here and show you how it works. It's kind of smart. Most vents like
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this have a plastic flap inside that just falls down by gravity but this has got a styrofoam ball
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and as you can see it closes off by gravity when there's no air flow but as soon as the dryer or
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the exhaust fan turns on it lifts the ball out of the way and you can see now there's an opening
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that the air can get out. When the fan shuts off it falls down again. This vent has been in use for
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more than 10 years now and it works every bit as well today as it always did