Are you looking for a reliable way to reduce your cooling costs while keeping your home cooler and more comfortable year-round? So, you have found just what you're looking for! Made with top quality materials, craftsmanship and engineering, the iLiving Shutter Exhaust Fan is designed to offer superior ventilation in any space you choose to install to keep your living space cooler and more comfortable year-round while reducing expensive cooling bills. Heavy-Duty, Galvanized Steel Frame; Weather Resistant Aluminum Shutters and Blades; Motion-Balanced for Quiet Operation; Thermally Protected and Permanently Lubricated Motor; Automatic Shutters; For Home Cooling and Ventilation; Corrosion-Resistant Wire Guards; Variable Speed Setting Functionality On Select Sizes (controller sold separately); UL Listed; Available in (8 or 9) Size VariationsPerfect Cooling and Ventilation Solution For Homes, Attics, Garages, Sheds; Reducing Cooling Costs and More. The fan comes fully assembled out of the box; For Variable-Speed-Control feature, recommend to use with the iLIVING speed controller : ILG8SFST (Thermospeed) or ILG8SFRC (Remote Kit), which is sold separately.