Hartzell's reputation for propeller fans is legendary, no manufacturer offers a more complete line of wall exhausters, roof ventilators, man coolers, cooling tower and heat exchanger assemblies, and in-line axial fans. Available in steel, stainless steel and fiberglass, sizes from 12" diameter to over 120" diameter. Specialty designs like recirculating roof ventilators and filtered intake fans are standard products. When you need a fan in a hurry Hartzell's Stock Program Delivers.