Core "DC Fan" fan technology is bearing technology. Bearing fan is the largest part of the cost. Many different types of fan bearings, we introduce some of the most common: One is the traditional ball bearing seal bearing improvement. Between its rotor and stator are lubricated with the ball, and with oil. It overcomes the short seal bearing life, running instability problems, but rising costs are extremely limited. It absorbed the advantages of single ball bearing seals and double ball bearings. The bearing life raised to 40,000 hours, after which the ball, run the noise has increased, but still less than the double ball bearings.