Rooftop air conditioning unit, a simple and reliable duct air conditioning system, has been widely used in many comfort areas, such as factory and supermarket.

屋顶空调机组由于其设计简单，安装使用方便，广泛应用于厂房和超市等场所。

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The last known case was in Britain in 1978 when a university photographer who worked above a lab handling smallpox died after being accidentally exposed to it from the building's air duct system.

众所周知的世上最后一例天花发生在1978年的英国。 那是一个（无辜的）大学摄影师，当时他正在天花实验室的楼上房间里工作，死于接触到大楼的风道系统偶然带出来的天花病毒。 （译者注：这位摄影师也太冤了。）

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Analyses the testing results of some project examples after air duct cleaning.

分析了几个实际工程风管清洗后的测试结果。

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The Picnic room features a sizable picnic table, astroturf, and a paper-mache tree that was fashioned out of an air duct.

FORBES: Startup Hires Set Designers to Trick Out Office on a Dime

They soon found that duct tape leaked air so badly much of the cooling and heating was wasted--and that the tape frequently shrunk, dried up or separated.

FORBES: The Other Greatest Tool Ever

Consider media accounts of how WD-40 was used to extract a python from a bus exhaust pipe or a burglar stuck in an air duct (yes, he was arrested).

FORBES: Greasy Coca-Cola