18"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 13.75"h] Aluminum Bar /* Adding space between bullet

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Actual Filter Size – 9 3/4"w x 7 3/4" x 1"

Sleek Design – The clear and unobtrusive design ensures it blends seamlessly with any home

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Actual Filter Size – 15 3/4"w x 19 3/4" x 1"

18"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 13.75"h] Aluminum Bar /* Adding space between bullet+ Product Details Size 18"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 13. 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