14"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 9.75"h] 18" Round Duct Pipe + Product Details Size –

+ Product Details Size – 26"w X 20"h is the size for the duct opening measurement only

Roundover Beveled Edges

Heavy Gauge Steel – Heavier gauge than needed

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

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14"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 9.75"h] 18" Round Duct Pipe + Product Details Size –+ Product Details Size 14"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 9. 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