Axial Fan, Shape SquareCFM @ 0.000-In. SP 55, Voltage 115VAC, 0.12 Amps, 11 Watts, Electrical Connections Terminals, 33.5 dBA, Bearings Sleeve, 60/50 Hz, 1 Phase, Fan RPM 1750, Height 4-11/16 In., Width 4-11/16 In., Depth 1-1/2 In.Mounting Position Vertical, Mounting Eye O.C. 4-1/8 In., Motor Type Shaded Pole, Motor Insulation Class A, Thermal Protection Impedance, Max. Ambient Temp. 158 Degrees F, Blade Material Polybutylene Terephthalate, Housing Material Cast Aluminium RestrictionsNote: Sleeve-bearing fans must be mounted for horizontal airflow only. Ball-bearing and zero-friction fans may be mounted in any position. Axial FansSingle-speed fans are not speed-controllable. All AC units are rated at 60/50 Hz (50 Hz operation will decrease CFM by approximately 20%). Zero-friction fans eliminate friction between shaft and bearing for rotational stability. Optional fan guards and cord sets available separately on page 4473. UL and C-UL Recognized Component, CE Certified, and RoHS Compliant.Square ACDriven with impedance-protected shaded pole or thermally-protected PSC motor.