20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] w18h18 75"H – fits a 14"

75"H – fits a 14" X 4" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10” x 8” duct openings

+ Product Details Size - 30"w X 24"h X 2"d (for duct opening measurement only)

20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] w18h18 75"H – fits a 14"+ Product Details Size 20"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 13. 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