I believe that 12.5 X12.5 is the standard vent size, and 14X14 is the standard cover. As long as your vent framework extends out of the ceiling, you shouldn't have a water issue.
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Kelly and Jerry Powell with Halo (Lethal White Aussie), Nash the Rat Terrorist, and now Reid, the "Brindle we have no idea puppy"
2020 Grand Design Solitude 390RK-R
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