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Most homeowners believe the purpose of attic ventilation is to remove heat that builds up in the summer.  That's accurate of course. But what that answer leaves out is just as important as what it includes.

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When winter arrives and temperatures plunge, you might think the movement of heated air would no longer cause problems in attics.  But that's not true.  With seasonal changes, the conditions just reverse.  Heat doesn't travel from an attic into the living quarters.

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What's the purpose of attic ventilation?  It seems like a simple question, easy enough to answer.  Unfortunately, all too often, that's not the case.

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Although the problems of attic heat and moisture have different causes, they share a common solution: a high-efficiency ventilation system that allows a uniform flow of air to sweep the underside of the roof sheathing.

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When homeowners set out to eliminate ice dams, their typical response is to add more insulation to attics.  But no amount of insulation, if used alone, can eliminate the formation of ice dams.  An efficient attic ventilation system must be part of any solution.

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How Ventilation Works

The word "ventilate" comes from the Latin word for "to fan," the action of causing air to move.  And that's exactly how ventilation works:  it provides the conditions that allow air to move. And that's exactly how ventilation works: it provides the conditions that allow air to move.

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Types Of Vents

In describing how ventilation works, we discussed intake and exhaust vents in general terms, perhaps giving the impression that a single type existed to serve each function.

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