28"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 17.75"h] Supply Grille fasten the edges to studs

fasten the edges to studs with the provided screws

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

The integral multi-shutter damper with a convenient handle operator ensures that you can easily adjust the air volume

+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 34 5/8" height

28"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 17.75"h] Supply Grille fasten the edges to studs+ Product Details Size 28"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 17. 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