6"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 13.75"h] Color_Aluminum + Product Details Size -

+ Product Details Size - 24"w X 18"h is the size for the duct opening measurement only

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

[Outer Dimensions: 12

+ Product Details Size – 8" x 22" or 22" x 8" is the size for the duct opening measurement only

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6"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 13.75"h] Color_Aluminum + Product Details Size -+ Product Details Size 6"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 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 wear