Centrifugal Fans: 1) Voltage: 110V, 115V, 220V, 230V 2) Frequency: 50 / 60Hz 3) Material: galvanized sheet, with external rotor motor 4) Matched with tube fan 5) Super quality, low noise, substitutes EBMimilar blower 6) Size: the same as EBM 7) OEM serviceFor more information, Please visit our website or contact us.