... airflow: 1900m3/h 3, Low noise ventilation fanec centrifugal ventilation fan Backward Curved Type: SC310E3-ACT-00EC exhaust fan1,Energy saving ... completely integrated within the motor.5.High performance : One EC fan replace multiple type of motors (2, 4 and 6 pole) ... blowers 2.Automobile fans/blowers, such as bus fan and blowers, small car fan, refrigeration cars 3.Household appliances fans/blowers, ...