The bearing, oil seal, silencer and leaf of the fan are wearing parts with limited life and should be changed periodically.
风机的轴承，油封及消声器，叶片等属于消耗品，故有一定寿命，需定期更换。
Reversible rotor extends a much longer service life of wearing parts due to the reversible feed guiding mechanism and the automatic changing of motor rotation direction by dint of limited switches.
可换向进料导向机构和通过行程开关自动改变电机的转向，从而实现转子正反向工作，大大延长易损件的使用寿命；
Limited life components or parts such as heat fixing unit for laser products, print head for inkjet products from 2 nd and 3 rd year are not included.
消耗性元件或零件，例如镭射打印定影器及喷墨打印头等，均不包括在第二年及第三年之保养范围内。
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