... quietly 2.Positive and negative rotation Brushless Direct Current Motor is a type of energy-saved motor. It owns following characteristics:1) ... High efficiency: In general, the efficiency of single-phase AC motor is under 30% , but the efficiency of single-phase ... , Wall Fan, Air Pump, Range Hood 24v Brushless motor Micro motor Dc motor for home electric fan, wall fan, stand fan, tower fan, humidifier, ...