36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] Powder-Coated + Product Details Size -

+ Product Details Size - The listed 5" diameter refers specifically to the size of the duct opening

you can attain the diameter of the vent

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 26" OR 26" x 20" duct opening (measured at the opening)

If your duct opening is 14 inches in diameter

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36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] Powder-Coated + Product Details Size -+ Product Details Size 36"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 7. 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