8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 9.75"w x 9.75"h] Height_32in Always measure the actual opening

Always measure the actual opening in your ceiling or wall

this model allows for mounting without removing the thermostat

+ Product Details Size & Compatibility – The 8" stick-on Side take-off is compatible with duct 8"

Installing a collar is the first step when installing the system of ducts

+ Product Details Size - 22"w X 18"h X 2"d (for duct opening measurement only)

8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 9.75"w x 9.75"h] Height_32in Always measure the actual opening+ Product Details Size 8"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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