12"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 19.75"h] 10" Diameter + Product Details Size -

+ Product Details Size - 34"w X 32"h is the size for the duct opening measurement only

+ Product Details Compact and Secure Design - Measures 3-7/8" wide x 3-1/2" high x 3" deep

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

European: EN 10270-1-SM

12"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 19.75"h] 10" Diameter + Product Details Size -+ Product Details Size 12"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 19. 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