机身设置有两个进风口和一个出风口，进风口处各设置有活动挡板，可通过开启或关闭挡板实现除沙尘模式及自然换气模式；
Provided with two air inlet and an outlet and inlet settings active bezel, you can open or close the tailgate to achieve besides the dust model and natural ventilation mode;
你可以使用象3-2-3 - 2模式…，这个次数是指两次换气之间的划臂次数。
You could use a pattern like 3-2-3-2... the Numbers being the number of strokes between breaths.
工业换气扇型号可选任何壁挂或底座安装模式，24英寸或30英寸直径的叶片。
Industrial Ventilation Fan models are available in either wall mount or pedestal mount models and feature blade diameters of 24 "or 30".
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