20"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 31.75"h] Round Damper Ring Simplified Installation: Our Radial Damper

Simplified Installation: Our Radial Damper ensures easy setup

listed size +2" diameter

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

color: #111

making installation a breeze

20"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 31.75"h] Round Damper Ring Simplified Installation: Our Radial Damper+ Product Details Size 20"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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