14"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 19.75"h] Compatible with Duct 6" + Product Details Size -

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 14"h is the size for the duct opening measurement only

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Crafted with a solid steel body

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 6" duct openings

14"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 19.75"h] Compatible with Duct 6" + Product Details Size -+ Product Details Size 14"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 9. 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 wear