Optimus brings you the finest in fans and heaters. The F-4182 is an 18 Inch industrial grade high-velocity fan. Three speed high-torque motor reinforced wire grill for added safety front mount speed control all metal construction aluminum heavy duty 12 inch blade head tilts for use as air circulator OSHA approved three prong grounded plug straight up ceiling to floor ventilation. Satisfaction ensured. Manufactured to the highest quality available.