Lasko's Weather-Shield® Select Box Fan with Thermostat features an adjustable thermostat to turn the fan on or off automatically. With 3 speeds, and a broad 20-inch blade, you'll enjoy cooling air velocity that's ideal for exhausing stale air, drying a wet floor, or simply creating a cooling wind chill effect. The Ultra Performance grill design provides up to 20% more air flow. Three energy-efficient speeds and the Weather-Shield® motor for worry-free indoor window use. Equipped with Blue Plug safety fuse technology, making this fan a safe and an energy-efficient option. 2-year limited warranty.