There's a reason box fans have been around so long: They're classic workhorses of comfort, and the Air King 9723 20-Inch 3-Speed Box Fan is a thoroughbred. Simple, strong, and efficient, this commercial box fan is ideal for workshops, stores, salons, dorm rooms and all sorts of contained spaces. With a durable steel box and 6-foot grounded, 3-conductor power cord, this industrial box fan is a model of convenience. A top rotary switch (no reaching around back or at the bottom) easily switches among its three speeds, and those three speeds really move the air. Thanks to a 1/25 HP, permanently lubricated motor, this commercial box fan is both quiet and powerful, circulating air 2163/1900/1463 CFM at high/medium/low speeds. Chemical-resistant blades are made of polypropylene, and they're protected by impact-resistant plastic grills on the front and back. Thanks to our rigorous safety testing, this box fan is ETL-listed and complies with OSHA requirements. Peace of mind and effective, smart comfort are the hallmarks of Air King, and you've got it in spades with this commercial box fan.