Not all parts of a vent are literally 14"x 14"
The 14" x 14" refers to the hole cut in the roof. Part of the vent slips into that hole and is actually smaller, the cover has to extend over the edges of the whole assembly so it must be larger. Trust me, a cover "rated" for a 14" x 14" vent will fit. The vent hole is 14" x 14" but the cover is not.
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Frederick - The Scaleman
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