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I used something like this (4 in. Round Wall Vent). It only flaps when the wind is really blowing.


Based on the International Residential code (which may or may not apply where you live), this installation is not compliant. Things that I see that need to be corrected include (but may not be limited to): The vent must be held at least one inch away from wood and other combustibles. The total rise of the vent must be at least five feet, to insure proper ...

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