16"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 27.75"h] Return Grille + Product Details Perfect Fit

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

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

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+ Product Details Size – 12" x 32" or 32" x 12" is the size for the duct opening measurement only

16"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 27.75"h] Return Grille + Product Details Perfect Fit+ Product Details Size 16"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 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