10"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 11.75"w x 11.75"h] sidewall + Product Details Size –

+ Product Details Size – 12"w X 8"h is the size for the duct opening measurement only

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

Actual Filter Size – 9 3/4"w x 11 3/4" x 1"

actual front end outer dimensions are 31

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10"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 11.75"w x 11.75"h] sidewall + Product Details Size –+ Product Details Size 10"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 11. 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