220V AC Cooling Fan Three Silent measures

"220V AC Cooling Fan" a silent support. The United States' Pumaweike "oil, non-volatile, non-condensing, liquefaction, high lubricity, so that the motor is running even stronger, no noise.
"220V AC Cooling Fan" silent support two:
Fully enclosed motor shook his head gear box components, effective noise, dust, to create a truly long-life motor mute
"220V AC Cooling Fan" silent support three
Excellent uniformity of the air gap (inner diameter tolerances strictly controlled in 0.25mm), reducing machine vibration and noise