Cooling Fan Manufacturer bearing system

"Cooling Fan Manufacturer" bearing system is generally what is it? Recommend the best selection of a ball bearing, the life of the hot air fan because the fan is usually dependent on the reliability of its bearing, ball bearing systems have been shown to have high efficiency and low heat characteristics. "Cooling Fan Manufacturer" rolling friction ball bearing genera, rolling of metal beads, small contact surface, the friction coefficient is small; and oil-bearing for sliding friction, a large contact surface, after long-term use, the oil will be volatile, bearing easy to wear, friction coefficient late noisy, short life. Good quality "Cooling Fan Manufacturer" in addition to ventilation volume, high pressure outside, reliability is very important, bearing fan used in this form is very important.