18"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 15.75"h] Return pair it with our butterfly

pair it with our butterfly dampers

+ Product Details Size – 32"w X 25"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening)

875" width X 13

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

18"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 15.75"h] Return pair it with our butterfly+ Product Details Size 18"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 15. 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