... 1.corrosion resistant, long service life 2.large wind,low noise 3.light weight 4.excellent performance 5.easily use, ... : 1. Motor using punching shell, low-noise ball bearing, with over-temperature protection, low temperature rise, low power consumption, good insulation, long life ... of electrical and air, the wind a large amount of noise in small, smooth intake, stable and economic energy. Certificate ...