Size - 16"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17.75" 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 3/16” 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 through leaving the material with an elegant, beautiful, and smooth surface, adds a luxurious touch to any home. Carefully Shrink Wrapped – With cardboard backing to prevent damage in shipment Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers. These are built heavy duty for installation into brick and cement walls.