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When we got our new roof we just did the ridge vents. It is about the same as when we had the old two power vents using electricity once the attic was 100 degrees. The spinning vents work great, but finding one that is of good quality is a real challenge now days. Most are made in China garbage and the bearings are just a cheap bushing that wears out in a year or two. Nothing more fun than hearing squeak squeak squeak all night while trying to sleep.
So pay the money and step up to one with a real ball bearing design. Good luck on finding the good ones, most are the chinesium garbage.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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