To limit the probability of a large number of openings in a firewall, which could lead to the failure of the protective closures for these openings during a fire, which could lead to the spread of fire from the building to an adjacent building, which could lead to damage to the adjacent building.
To limit the probability of a large number of openings in a firewall, which could lead to the failure of the integrity of the firewall, which could lead to the spread of fire from the building to an adjacent building, which could lead to damage to the adjacent building.