8"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 19.75"h] Material_Aluminum actual front end outer dimensions

actual front end outer dimensions are approximately 24 5/8" width X 8 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 12" duct openings

making it ideal for preventing tampering or unauthorized adjustments

+ Product Details Size – 6"w X 6"h is the size for the duct opening measurement only

8"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 19.75"h] Material_Aluminum actual front end outer dimensions+ Product Details Size 8"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear