Effective in case of fire
The security of a building is intimately linked to the compartmentalization of its floors. In the event of a fire, this will substantially reduce the migration of smoke from one tier to another. Without this compartmentalization, the risks of poisoning and mortality will be much higher.
The story of a Toronto apartment building that was burned to light in the 1980s is a perfect example. The flames had started on the third floor. However, several occupants who were on the 14th and 15th floors died of asphyxiation, as the chimney effect did its work by sucking smoke upwards. A few years later, another similar fire broke out in a twin tower. However, it had been the subject of work to compartmentalize its floors. As a result, the smoke did not migrate to the top, sparing some occupants from potential death.
To prevent the spread of smoke in the event of a fire, the perimeters of unit doors and stairwells must be sealed with watertight weatherstripping. This sealing also applies to the slabs of underground parking lots, in order to avoid emissions due to carbon monoxide, as well as to the drilling of concrete slabs on each floor. These holes are intended for the mechanical elements of a building.