16"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 13.75"h] d our Radial Damper simplifies the

our Radial Damper simplifies the process of managing airflow

+ Product Details Size – 16"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 40"w X 20"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

16"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 13.75"h] d our Radial Damper simplifies the+ Product Details Size 16"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 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