26"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 13.75"h] Material_Aluminum + Product Details Size -

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 20" OR 20" x 22" duct opening (measured at the opening)

26"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 13.75"h] Material_Aluminum + Product Details Size -+ Product Details Size 26"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 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