通常为手持式半自动小型风扇它外观接近于电动的小型手持式风扇区别在于动力来源于一个人工手压的简易装置可以是直接转化为机械能或者转换为电能并储备在内置的小型蓄电池或可安装在压力风扇内的外置蓄电池其工作原理可以参考借鉴与压力电筒 优点环保方便 缺点累人麻烦
有时候，这种增量可以克服风扇电机的静态压力，并减少系统中空气的容量。
Sometimes, this increase can overcome the static pressure rating of the fan motor and reduce the volume of air through the unit.
排风扇使泵房内的空气压力比建筑物内其它房间的压力低。
Exhaust fans maintain a lower pressure in the pump room than in any other part of building.
同时，对风扇流场的压力和速度进行分析；研究了风扇流量、风扇转速、扇叶数和气动噪声相互之间的关系。
In addition, the pressure and velocity in cooling fan flow field are analyzed and the relations between flow rate, rotation speed, blade number and aerodynamic noise of cooling fan are studied.
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