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

+ Product Details Size - 6"w X 28"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

+ Product Details Size - 24"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening)

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