For blower fan coil, adopting local drop ceiling when they are setting with new wind, but adopting a manner of katabatic wind when they arn't setting with new wind.

对于风机盘管，加新风的部分采用局部吊顶，不加新风的部分采用下送风的方式。

youdao

I'm writing this blog from Petermann Glacier in northwest Greenland, where a cold katabatic wind is blowing off the ice onto the deck of the Greenpeace ship Arctic Sunrise.

CNN: The story