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

actual front end outer dimensions are approximately 18 5/8" width X 10 5/8" height

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

actual front end outer dimensions are approximately 14 5/8" width X 22 5/8" height

actual front end outer dimensions are approximately 32 5/8" width X 28 5/8" height

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