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In my case there are three 14" square roof vents, with a whole house fan on the center one. So it can suck up on the center one and blow down on the two ends. It may not be as efficient but it works with what's there.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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