30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] Powder Coated + Product Details Size -

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are 37

actual front end outer dimensions are approximately 14 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 41

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 28" OR 28" x 22" duct opening (measured at the opening)

30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] Powder Coated + Product Details Size -+ Product Details Size 30"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 11. 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