About This For Outdoor Air Circulation: It is a solar dual fan kit for intake or exhaust air for keeping outside space air fresh and cooling from the Summer hot days Weatherproof Function:The whole fan kit is waterproofed for outdoor use which stay well in different weather, such as storm, snow, hot weather. Working Temp from -13℉to 140℉ 5.5 Inch Bigger Fans: We add 2 units 5.5-inch dual fan which is bigger than other 4.7 inch fan to provide higher air flow 3500RPM Fan Speed: Our fan with high-speed motor which up to 3500 RPM, compare with other product 2500, 3000 RPM Fan speed 25W Solar Panel Powered: The whole kit powered by a 25W solar panel to provide decent power supply, the solar panel is big which size is 15.4x13 inch Overview Brand : Roodike Color : Black Electric fan design : Exhaust Fan Power Source : Solar Powered Style : Modern Product Dimensions : 5.5"D x 1"W x 5.5"H Room Type : Chicken Coop, Shed, Greenhouse, Pet House Special Feature : Solar Powered, Waterproof Recommended Uses For Product : Air Circulation, Exhausting, Ventilating Mounting Type : Wall Mount