28"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 23.75"h] d + Product Details Size –

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

with actual outer dimensions of 36

Actual Filter Size – 31 3/4"w x 31 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

+ Product Details Size - 14"w X 30"h is the size for the duct opening measurement only

28"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 23.75"h] d + Product Details Size –+ Product Details Size 28"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 23. 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