8"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 23.75"h] steel + Product Details Size –

+ Product Details Size – 36"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 28 5/8" height

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

The included eight-tumbler lock and supplied key provide secure access

actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

8"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 23.75"h] steel + Product Details Size –+ Product Details Size 8"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear