该设计两次运用回转接头，解决了局部排风系统中罩口的机动功能，已被广泛地应用于现场排尘排毒工程中，使用方便，效果良好。
The design project has applied the return joint two times to the solution of mobility of the hood of the local exhauster system. It has been widely used in practice.
传统排风罩和气幕上吸罩是两种工作原理不同的局部排风设备。
The traditional exhaust hood and canopy hood with attached air curtain have different principles.
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