26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] 10in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 18 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 16" OR 16" x 30" duct opening (measured at the opening)

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

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26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] 10in diameter actual front end outer dimensions+ Product Details Size 26"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 19. 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