24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 37.75"h] 18" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 25

With a 5" diameter for the duct opening measurement

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 18" duct openings

Actual Filter Size – 11 3/4"w x 7 3/4" x 1"

Each grille is securely shrink-wrapped with a cardboard backing to prevent damage during shipment

24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 37.75"h] 18" Diameter actual front end outer dimensions+ Product Details Size 24"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 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