Ventilation pipe is vital part of ventilation system.

通风管道是通风系统的重要组成部分。

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Therefore, ventilation pipe quality is very important.

所以，通风管道质量是很重要的。 。

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What is the installation and maintenance skills of ventilation pipe?

通风管道安装保养技巧有哪些？

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Negotiators have been talking to the man through a 4in-wide (10cm) ventilation pipe.

BBC: Alabama hostage standoff for five-year-old continues

Authorities have been conferring in a nearby church and communicating with Dykes through a ventilation pipe to the underground bunker.

NPR: Ala. Town Mourns For Bus Driver Amid Standoff

During the six-day standoff, officials talked to Dykes and delivered medication and toys to the boy through a 4in (10cm) ventilation pipe.

BBC: Alabama kidnapper dead and boy saved after police raid