Details about Maer axial fan motor model:YSWF74L4-522N-450/YDWF74L4-522N-450 voltage: 380V / 220V frenquency:50Hz air volume: 5,180m3/h/5,180m3/h speed: 1,380RPM/1,380RPM input power: 240W/240W current: 0.65A/1.08A noise:68dBA/68dBA impeller:5 impellers net: 8kg insulater class: B (F is possible) ------------------------------------------------------------------------------ plastic impellers model:YDWF74L6-3-522N-450 voltage: 220V frenquency:50Hz air volume: 4,590m3/h speed: 900RPM input power: 165W current: 0.8A noise:58dBA impeller:3impellers plastic fan net: 5.4kg insulater class: B (F is possible) ------------------------------------------------------------------------------ model:YSWF74L6-522N-450/YDWF74L6-522N-450 voltage: 380V / 220V frenquency:50Hz air volume: 4,590m3/h/4,590m3/h speed: 1,380RPM/1,380RPM input power: 160W/160W current: 0.48A/0.75A noise:62dBA/62dBA impeller:5 impellers net: 8kg insulater class: B (F is possible)