Standard-Duty Industrial Fan, Blade Dia. 18 in, Stationary, Non-Oscillating, 2 Speeds, Voltage 115V AC, 1 Phase, CFM High 4550, CFM Low 2950, Air Velocity @ 20 Ft. 365/315 fpm, Motor HP 1/4 hp, Motor RPM 1100/850, Operating Amps 2.0/1.4, Fan Mounting Location Fan Head Only, Fan Accessory Style Standard, Fan RPM 1100/850, Sound Level 72 dBA, Max. Ambient Temp. 104 Degrees F, Hz 60 Hz, Watts 220/160, Motor Type Permanent Split Capacitor, Drive Type Direct Drive, Outside Dia. 21 In., Height 21 in Standard-duty industrial fan heads provide cooling in heavy manufacturing areas and other dusty or dirty environments. These fan blade, motor, and guard assemblies can be paired with a new or existing bracket or base.Industrial fan heads are assemblies for replacing a broken fan head on an existing m.