18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 19.75"w x 25.75"h] Compatible with Duct 10" actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 18 5/8" width X 38 5/8" height

and with a built-in back 1/2" mesh they also protect you from annoying rodents like mice

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

ventilation

18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 19.75"w x 25.75"h] Compatible with Duct 10" actual front end outer dimensions+ Product Details Size 18"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 25. 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