36"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 27.75"h] Fixed Blades + Product Details Size –

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

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+ Product Details Size - 12"w X 28"h X 2"d (for duct opening measurement only)

Design – Individually adjusting curved blades

Experience enhanced indoor comfort with our 6" Butterfly Damper

36"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 27.75"h] Fixed Blades + Product Details Size –+ Product Details Size 36"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 27. 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