16"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 35.75"h] 10" Diameter + Product Details Size –

+ Product Details Size – 8" x 18" or 18" x 8" is the size for the duct opening measurement only

75"H – fits a 10" X 10" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening)

actual front end outer dimensions are approximately 14 5/8" width X 14 5/8" height

16"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 35.75"h] 10" Diameter + Product Details Size –+ Product Details Size 16"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 35. 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