28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] 12in diameter The grille features counter-sunk screw

The grille features counter-sunk screw holes that prevent paint from peeling during installation

actual front end outer dimensions are approximately 21

By means of the smooth surface

75"H – fits a 12" X 4" duct opening

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] 12in diameter The grille features counter-sunk screw+ Product Details Size 28"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 13. 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