18"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 17.75"h] Fixed Blades with Damper /* more inner breathing room

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16" Diameter Is The Size For The Duct Opening Measurement Only

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Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

18"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 17.75"h] Fixed Blades with Damper /* more inner breathing room+ Product Details Size 18"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 17. 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