Lasko Weathershield Select 20" Box Fan with Thermostat. Adjustable thermostat turns fan on or off automatically - great for nightime use in a window. Ultra performance grill design moves up to 20% more air than basic box fans. Easy to use top mounted controls, with sturdy top mounted handle. Patented, Isolated Weathershield motor for worry free window use. Energy efficient operation costs only pennies a day to run. Wide body for greater floor stability. 3 speeds. 2 year limited warranty. ETL Listed. 110 watts. 6ft cord. Black.