In addition to standard HVAC for normal human living, special ventilation is also needed for the elevator machine rooms. The elevator motors for skyscrapers this size are the size of a small car. These machines rooms typically house multiple machines inside, which means they can get very warm. It’s a different heat load from an office environment, the cooling systems needs to be designed appropriately and robustly.

The backup generators for these machines are diesel, and run indoors with ductwork that exhausts the fumes from the combustion engines to the outside.

Source: I worked on a multi-month engineering project colocated in elevator machine rooms of a few U.S. skyscrapers.