另一个例子是热回收通风机是封闭在一个小衣柜，以防止从地下室从越过墙了空气。
Another example is the heat recovery ventilator which is closed off in a small closet, to prevent air from the basement from coming up through the walls.
在实验室环境研究轴流式通风机噪声的主动控制问题。
The initiative control of the noise producing by axial flow ventilator is investigated in experiment environment.
同时根据教学需要，利用虚拟现实技术，开发一套通风机性能测试虚拟实验室系统。
At the same time, depending on teaching need, we developed a virtual experiment system of fanner's performance testing by virtual reality technology.
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