Designed for heavy-duty applications, a breakthrough in motor design allows the powerful AirVolution D 780 fan to generate 75% more wind power. This makes it perfect for extra-large spaces like warehouses, airplane hangers, airports, and stadiums. The fan's durable design also eliminates the gearbox for easy installation, zero aintenance, and operation that's practically inaudible. And to ensure safe and reliable performance, the full line is Wash Down rated for indoor or outdoor use.