26"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 11.75"h] Aluminum Adjustable Curved Blade actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

+ Product Details Size – 34"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 6" OR 6" X 18" duct opening (measured at the opening)

+ Product Details Size – 24"w X 34"h is the size for the duct opening measurement only

26"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 11.75"h] Aluminum Adjustable Curved Blade actual front end outer dimensions+ Product Details Size 26"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 11. 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