These fans are designed for commercial applications requiring high volumes of air at low to medium static pressures. The air-handling-quality bearings meet a minimum of L10-100,000 hours. Heavy Duty Fans feature 6-blade heavy-duty cast-aluminum propellers, heavy-duty drive-frame channels, a bearing plate, and a motor plate. Medium Duty Fans feature 5-blade reinforced galvanized-steel propellers, heavy-duty drive-frame rails, and a 1-pc. motor/bearing plate. Standard Duty Fans feature 6-blade galvanized-steel propellers, rigid drive-frame rails, and a 1-pc. motor/bearing plate.
Note: OSHA complying guards are required when a fan is installed within 8 ft. of floor, working level, or within reach of personnel.