18"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 31.75"h] Fixed Blades Size - 10"w X 10"h

Size - 10"w X 10"h is the size for the duct opening measurement only

Superior Airflow Control: Built-in damper lets you control how much air enters your room

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

Airflow Control – Adjustable airflow lever allows precise control over the direction and volume of air

18"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 31.75"h] Fixed Blades Size - 10"w X 10"h+ Product Details Size 18"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 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