10"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 25.75"h] w12h12 actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 16 5/8" height

Example: If your hole is 20" wide by 14" tall

the actual front end outer dimensions are 6" in diameter

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

[Outer Dimensions: 22

10"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 25.75"h] w12h12 actual front end outer dimensions+ Product Details Size 10"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 25. 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