Both ventilation systems can be operated or supported mechanically if desired.

如果需要的话，两者都可以通过机械控制或支持。

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Once each season, perform the following checks on heating and ventilation systems.

每季节一次，对取暖和通风系统进行以下检查。

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"I stayed on because I was concerned about the roof and hanging lights and ventilation systems," he said.

“我留在火车里面，因为我担心车道的顶部和悬挂的灯会掉下来以及通风系统可能有问题，”他说。

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But then farms began to use new ventilation systems.

VOA: special.2009.09.08

On the practical side, it also houses the ventilation systems for everything below grade, from transportation to the memorial museum.

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Fire brigade crews used their ventilation systems and were first into the building to douse the flames before Green Goddess crews aided the evacuation.

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While the research could help inform practices in older NHS buildings, many newer UK hospital buildings feature no opening windows and complex computer-controlled ventilation systems.

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