The partition wall just reaches the ceiling, so there is an air flow in the ceiling which will enter into the labs through the manhole.
The partition wall just reaches the ceiling, so there is an air flow in the ceiling which will enter into the labs through the manhole.
实验室隔墙只到吊顶处，吊顶内部空气是互串的，通过检修预留洞口及其它洞口处漏到实验室内部。