ventilation motor (1) smooth running, (2) good starting, (3) long service life fan motor, ac fan motor, ventilation motor: the detail datas of this product:ModelVoltageFrequencyOutputSpeedElectrodeNoise dbcapacityYHS-9022050/6035800/13504<453YHS-6522050/6020800/13504<452YHS-5522050/6018800/13504<451.8YHS-4022050/6010800/13504<451YHS-3022050/608800/13504<451YHS-40127601015004<454YHS-3012760815004< ...