20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] Aluminum Adjustable Curved Blade + Product Details Size -

+ Product Details Size - 18"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

and versatile for any project

75" width X 15

+ Product Details Size – 22"w X 20"h is the size for the duct opening measurement only

20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] Aluminum Adjustable Curved Blade + Product Details Size -+ Product Details Size 20"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 37. 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