16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 17.75"w x 9.75"h] Aluminum textContent = '+' 4 X 12 Is CRFG2028 Width_14in

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this thermostat guard combines dependable security with a professional and attractive appearance

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

actual front end outer dimensions are 9

16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 17.75"w x 9.75"h] Aluminum textContent = '+' 4 X 12 Is CRFG2028 Width_14in textContent = '+' this thermostat guard combines dependable security with a professional and attractive appearance