22"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 31.75"h] 10" Diameter + Product Details Size -

+ Product Details Size - 10"w X 32"h is the size for the duct opening measurement only

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

+ Product Details Size – 32"w X 16"h is the size for the duct opening measurement only

Adjustable airflow control - by rotating the middle disk

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22"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 31.75"h] 10" Diameter + Product Details Size -+ Product Details Size 22"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 31. 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