30"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 37.75"h] return grille while the included installation screws

while the included installation screws make setup quick and hassle-free

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 6" OR 6" X 16" duct opening (measured at the opening)

and then smoothly drop in the grill

75" Width X 21

30"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 37.75"h] return grille while the included installation screws+ Product Details Size 30"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 37. 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