The photo on the left was taken looking towards the hospital standing outside the new plant room built to house the new plant for the cataract theatre. As can be seen, the photo was taken while building works were still in progress.
The support frame /gantry is clearly shown with the pipe supported on top of it. Supply and extract air ducts are also visible.
The duct emerging from the wall of the new plant room is the extract air from the theatre and ancillary rooms.
The duct suspended from the frame on the right side is the supply air duct which also emerges from the new plant room (behind the person taking the photograph.)