8"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 15.75"h] sidewall + Product Details Heavy-Duty Steel

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior durability and reliable performance

+ Product Details Size - 22"w X 30"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 8" OR 8" X 16" duct opening (measured at the opening)

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+ Product Details Size - 12"w X 14"h is the size for the duct opening measurement only

8"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 15.75"h] sidewall + Product Details Heavy-Duty Steel+ Product Details Size 8"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 15. 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 wear