To limit the probability that a fire involving certain rooms will spread into an exit, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
To limit the probability that a fire involving certain rooms will spread into an exit, which could lead to fire emergency response operations being delayed or ineffective, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.