Providing 30-percent more air velocity than most standard box fans this 20-inch fan features the Wind Ring system an exclusive high-performance grill design that focuses the air movement increasing its velocity. The unit also offers three whisper-quiet energy-efficient speeds as well as a weather-shield motor for worry-free window use. Other highlights include an easy-to-use control knob a convenient carry handle a lightweight design and a wider body for greater stability. Made in the U.S. the UL-listed box fan comes fully assembled