6"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 31.75"h] 14in diameter + Product Details Size -

+ Product Details Size - 36"w X 18"h X 2"d (for duct opening measurement only)

fasten the edges to studs with the provided screws

By simply measuring the width or the length of the vent

actual front end outer dimensions are approximately 16 5/8" width X 24 5/8" height

with actual outer dimensions of 38

6"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 31.75"h] 14in diameter + Product Details Size -+ Product Details Size 6"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 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 wear