36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] 8in diameter accordion-content')

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+ Product Details Size – 18"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 10" X 4" is the size for the duct opening (floor/vent hole) measurement only

Its generous size and universal design ensure a perfect fit for a wide range of thermostat models

+ Product Details Size – 8"w X 32"h is the size for the duct opening measurement only

36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] 8in diameter accordion-content')+ Product Details Size 36"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 7. 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 wear