16"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 29.75"h] 12" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height -

strong aluminum construction with smooth finished edges for easy and safe use

16"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 29.75"h] 12" Diameter actual front end outer dimensions+ Product Details Size 16"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 29. 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