24"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 21.75"h] 14in diameter + Product Details Size -

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 14" or 14" x 12" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 32" OR 32" x 36" duct opening (measured at the opening)

+ Product Details Size – 24" x 30" or 30" x 24" is the size for the duct opening measurement only

24"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 21.75"h] 14in diameter + Product Details Size -+ Product Details Size 24"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 21. 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