20"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 11.75"h] Curved Blade Steel + Product Details Size –

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

allow you to customize airflow direction with ease

+ Product Details Size – 12"w X 34"h is the size for the duct opening measurement only

Simplified Installation: Our Radial Damper ensures easy setup

A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks

20"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 11.75"h] Curved Blade Steel + Product Details Size –+ Product Details Size 20"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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