24"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 21.75"h] Color_Aluminum + Product Details Size -

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 16" duct openings

+ Product Details Size - 22"w X 32"h X 2"d (for duct opening measurement only)

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

24"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 21.75"h] Color_Aluminum + Product Details Size -+ Product Details Size 24"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 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