34"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 17.75"h] 14" Diameter + Product Details Size –

+ Product Details Size – 4"w X 8"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 20" duct opening (measured at the opening)

provides a modern look and quiet operation due to its half-inch by half-inch cube design

Its sleek contours bring a touch of modern sophistication to any room

+ Product Details Size - 10"w X 14"h is the size for the duct opening measurement only

34"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 17.75"h] 14" Diameter + Product Details Size –+ Product Details Size 34"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 17. 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