回风管道 meaning in Chinese

return air duct

Tower 2 at core end needs a closed ceiling zone to hide the ducts of return air going into shafts
在芯筒尾部的2号楼需要有一段封闭的吊顶区域以隐藏回风管道进入斜井。
The zone supply and return air paths are used to describe the configuration of the flow path that the supply air takes in moving from the main air handler to the zone terminal units and that the return air takes on leaving the zones and returning to the central return air duct
空调区域的送风和回风路径用于描述，送风从主要空气处理设备到区域终端设备和回风从空调区域到集中回风管道的过程。