36"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 11.75"h] d /* Adding space between bullet

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With a 6" diameter for the duct opening measurement

actual front end outer dimensions are approximately 26 5/8" width X 24 5/8" height

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+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

36"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 11.75"h] d /* Adding space between bullet+ Product Details Size 36"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 11. 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