8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] 8" Round Duct Pipe + Product Details Size –

+ Product Details Size – 12"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 8"h is the size for the duct opening measurement only

75"H – fits a 24" X 10" duct opening

actual front end outer dimensions are approximately 30 5/8" width X 10 5/8" height

8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] 8" Round Duct Pipe + Product Details Size –+ Product Details Size 8"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear