... and small vibration:being adapted international famous qualified low noise ball bearing,it makes motor long life and no need for more ... name Production Line Capacity Actual Units Produced(Previous Year) AC Motor, DC Motor, HVAC Fan 3,700,000 Pcs / Year 1,797,260 ... corrosion tester YW/R-150 1 3.0 Acceptable High-low temperature test chamber RGD-250 1 3.0 Acceptable Noise ...