8"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 7.75"h] Width_20in actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 36 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 20" or 20" x 8" duct opening (measured at the opening)

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

+ Product Description Ventilate your home or commercial space with our Aluminum Outdoor Weatherproof Louvers

8"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 7.75"h] Width_20in actual front end outer dimensions+ Product Details Size 8"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 7. 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