ventilation fan diameter 310mm 1, Energy saving,high efficiency 2, VAC 1-100-130, airflow: 1900m3/h 3, Low noise ventilation fanec centrifugal ventilation fan Backward Curved Type: SC310E3-ACT-00EC exhaust fan1,Energy saving,high efficiency 2,Convenient control 3,Low noise 4,Long life time Advantages of EC exhaust fan:1.Energy savings : Minimum power consumption & better efficiency than AC ...