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Normally a well designed and installed ridge vent won't let in a drop (in a storm most buildings, in most locations are likely to see). In a rafter type roof system (vaulted ceiling) they are particularly important. As Whipped says, it takes advantage of the natural convection, warm air exiting the ridge and cool air entering the soffit. Without a RV or mechanical aids (fans), the lighter warm and moist air, is trapped up the roof line and minimal air exchange occurs. Cheers
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