Here is an example of fire caulking joints, it provides a tight seal against fire, smoke, toxic fumes and moisture. It can be used on plastic, insulated and glass pipe, construction gaps, dynamic joints, HVAC ductwork and insulated cable.
The manager of the construction was telling me about a problem that they had with the fire safety requirements: The back of this opening (the blue area) was supposed to be covered in gypsum, but there was no way that they could put in a layer of gypsum (there is no space) so they had to talk to the inspectors and be creative. They put gypsum on both sides, and they are going to put the sheet of gypsum on top of that, in a way that it can be included as part of the other room. Then they will put the dry wall as planned on top of the studs facing the hallway as seen here.
elevators are car-framed with a platform. Here the elevators are framed using steel (on the left we can see the wood framing on the wall)


The fire extinguisher was by the doors to the exits (stairs) which were also by the elevators