凝固，并清除风机内部积尘，若使用环境温度较低或温度较大时，应适当增加开机次数或通电时间。
User had better operates it not less than an hour per week to avoid components damping and grease lubricant freezing, and it can also clean the inner dust. It should be operated several times if working environment temperature is lowerorhigher.