12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 13.75"w x 13.75"h] w36h36 listed size +1

listed size +1

actual front end outer dimensions are approximately 38 5/8" width X 22 5/8" height -

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

Plain Ends - Gives you the freedom to cut and flare at your own project needs

12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 13.75"w x 13.75"h] w36h36 listed size +1+ Product Details Size 12"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 13. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never