Is it necessary to open the air outlet at the top of the computer room?

Need. There is a room that needs ventilation at the top of the machine, and the generator room requires good ventilation, so it is very important to properly ventilate the generator room. There is a machine room that needs a separate room to place the drive host and control system of the elevator, that is, there is a machine room, the highest floor of the whole elevator shaft, and the next floor is the elevator machine room.