This one which is similar with nylon bag is a ventilating unit.

这个类似尼龙袋的东西是一个排气装置。

There shall be integrated ventilating equipment in working site.

工作场所应有整体的良好通风设备。

Electric fan, Powerful fan, Ventilating fan, etc. are our main products.

电风扇，强力风扇，换气扇等，是我们主要的产品。

A passageway or shaft in which air circulates, as in ventilating a mine.

通风道，换气坑空气流通的通道，如使矿井。

Ventilating systems and equipment for the prevention of Marine pollution.

通风对防止海洋污染的系统和设备。