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叶轮材料为镀锌板；电机为外转子直流电机。
impeller material: galvanized sheet steel ;Motor: external rotor DC motor.
7.2风机在出厂检测时必须通过动平衡、振动和跳动测试：风机运转在1400±50r/min时，两边端面动平衡精度为G6.3,符合标准JB/T9101；风机的振动速度有效值按照JB/T8689标准规定；风机运行时，叶轮的轴向跳动和径向跳动小于等于1.0 mm。
At 1400±50r/min running speed, the residual unbalance of the fannot less than
G6.3(balancing precision grade) in each plane, according withJB/T9101，Vibration
speed virtual value of fans, test method accord withJB/T 8689.Runout of impeller
in axial and radial direction≤1.0 mm.
7.3风机防护等级为IP42；风机在额定电压、环境温度为40℃、全速运转时的寿命预算值40000小时。
Type of protection is IP42，determined when at rated voltage, running at full speed,
environment temperature of 40℃，Fan life expectance 40,000 hours.
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