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] Compatible with Duct 8" + Product Details Size -

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

excluding the old vent cover

Design – Cubic core eggcrate design Offers highest airflow efficiency at almost 95%

actual front end outer dimensions are approximately 28 5/8" width X 16 5/8" height

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

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] Compatible with Duct 8" + 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