30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] w30h30 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 10" duct openings

actual front end outer dimensions are approximately 25

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

+ Product Details Size - 30"w X 20"h X 2"d (for duct opening measurement only)

and lay it flat in the grid

30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] w30h30 Ideal for Walls & Ceilings:+ Product Details Size 30"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 11. 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