10"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 13.75"h] w32h32 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 30" OR 30" x 20" duct opening (measured at the opening)

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875" width X 12" height

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 10 5/8" height

10"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 13.75"h] w32h32 + Product Details Perfect Fit+ Product Details Size 10"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 13. 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