30"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 33.75"h] 10in diameter + Product Details Size –

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

Horizontal blades in the front

+ Product Details Size – 8" x 36" or 36" x 8" is the size for the duct opening measurement only

+ Product Details Size – 20" x 34" or 34" x 20" is the size for the duct opening measurement only

30"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 33.75"h] 10in diameter + Product Details Size –+ Product Details Size 30"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 33. 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