22"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 19.75"h] w12h12 + Product Details Size –

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

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 24" OR 24" X 16" duct opening (measured at the opening)

+ Product Details Size – 12"w X 26"h is the size for the duct opening measurement only

22"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 19.75"h] w12h12 + Product Details Size –+ Product Details Size 22"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 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