20"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 27.75"h] fixed bar + Product Details Size -

+ Product Details Size - 10"w X 10"h is the size for the duct opening measurement only

transparent appearance

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)

20"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 27.75"h] fixed bar + Product Details Size -+ Product Details Size 20"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 27. 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