14"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 21.75"h] Return + Product Details Size -

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

Horizontal performance assures confident use of cooling temperature differential of 30 degrees Fahrenheit and greater

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

+ Product Details Size – 24"w X 18"h is the size for the duct opening measurement only

also called T-Bar systems

14"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 21.75"h] Return + Product Details Size -+ Product Details Size 14"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 21. 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