Compact, short blowers units, good cooling of external-rotor motor and high efficiency; Material: Strengthened Nylon & phosphate sheetDiameter:190mm, 220mmMotor: 120V/60HZ, 0.63A, 8µF/370v, 2500RPM, Class B. 252 CFM,UL&cUL certified.Description:Compact, short blowers units, good cooling of external-rotor motor and high efficiency.