Compact Cooling Fans are ideal for applications where enclosure space is limited and quiet, reliable cooling is required. Engineered for 50,000 hours of continuous operation without lubrication or service. Maximum operating temperature is 158 F (70 C). 4-in fan is thermally protected and uses permanently lubricated ball bearings. Split-capacitor motors are thermally protected to avoid premature failure. Dynamically balanced impellers molded from polycarbonate material. One finger guard is furnished (additional finger guards are available). All mounting hardware is provided. 240 and 560 CFM fans have ball bearing construction and split capacitor motors. Fans have leadwires with ends stripped 1/2-in. (12-mm) or 6-ft. (1.8-m) cord with polarized plug for power connections. Nominal Size: 4 Voltage 115 VAC.