30"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 37.75"h] Adjustable Return + Product Details Size -

+ Product Details Size - 25"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 27 5/8" height -

+ Product Details Size - 28"w X 20"h X 2"d (for duct opening measurement only)

+ Product Details Size - 14"w X 26"h X 2"d (for duct opening measurement only)

30"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 37.75"h] Adjustable Return + Product Details Size -+ Product Details Size 30"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 37. 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