30"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 13.75"h] Color_R-8.0 Pink + Product Details Size -

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

With its reliable construction and sleek design

+ Product Details Size – 28"w X 10"h is the size for the duct opening measurement only

Optional Butterfly Damper Available At Asin: B007CNEL1W

30"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 13.75"h] Color_R-8.0 Pink + Product Details Size -+ Product Details Size 30"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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