Corrosion resistant galvanized steel housing, frame and blades. Enclosed air over belt drive motor is thermally protected. Galvanized welded wire guard on exhaust vent. Automatic belt tensioning and self-aligning pre-lubricated ball bearings for long life. 6 fan blades increase air flow at higher static pressure and provide low blade RPM for low noise level. 230V power cord with 3-prong plug. Fully Assembled. Optional Discharge Cones increase CFM without increasing motor size or energy cost. All galvanized steel with spin wire guard on exhaust. 3 Year Limited Warranty.