6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 23.75"h] Compatible with Duct 6" + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 26" or 26" x 10" duct opening (measured at the opening)

Actual Filter Size – 35 3/4"w x 31 3/4" x 1"

actual front end outer dimensions are 25" Width X 13" Height

+ Product Details Size - 18"w X 12"h X 2"d (for duct opening measurement only)

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6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 23.75"h] Compatible with Duct 6" + Product Details Perfect Fit+ Product Details Size 6"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 23. 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