The electric fan on the ventilation window consists of two axial flow blowers which can rotate forwards and backwards.

所述的通风窗口上安装有并排的二只轴 流风机构成的、可正反转的电风扇；

youdao

Don't rely on an air conditioner, ventilation system or an open window to clear the air.

不要依赖空调，排气系统或打开窗户来清洁空气。

youdao

Well, can we at least open the window and get some ventilation in here?

好,至少我们能开窗透气吧?

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Smoke travels upwards, and if smokers are confined to the top level and adequate ventilation is in place (be it an open window or a small fan), then there can be no cause for concern to those non-smokers who sit downstairs.

BBC: TRAPPED BY INCONSIDERATE SMOKERS