28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] Aluminum + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)

+ Product Details Size - 25"w X 22"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 32 5/8" width X 12 5/8" height

28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] Aluminum + Product Details Perfect Fit+ Product Details Size 28"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 9. 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 wear