8"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 27.75"h] Compatible with Duct 10" actual front end outer dimensions

actual front end outer dimensions are 15" Width X 15" Height

Its linear bar design maximizes ventilation

actual front end outer dimensions are approximately 26 5/8" width X 28 5/8" height

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

8"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 27.75"h] Compatible with Duct 10" actual front end outer dimensions+ Product Details Size 8"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 27. 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