best exhaust fan 1.low noise&lare airflow 2.durable motor 3.lower power consumption 4.good quality&competitve price best exhaust fanspecification:1.low noise&lare airflow2.durable motor3.lower power consumption4.good quality&competitive priceparameter: ModelStandard(mm)Voltage(v)Frequency(Hz)Watts(w)Speed(r/min)Flow rate(m3/h)APK25P25022050401400850APK30P300220504014001080APK35P350220/ ...