The optimus 18in industrial grade high velocity fan has a powerful 3 speed high-torque motor. Reinforced Wire Grill for Added Safety with an all metal construction makes this fan safe as well as durabale. Aluminum Heavy Duty 18" Blade. 360 Degree Circle Head Tilts for use as Air Circulator OSHA Approved Three Prong Grounded Plug Straight Up Ceiling to Floor Ventilation Color: Silver CoatedcETLus Listed