To limit the probability that certain service equipment that penetrates fire-rated assemblies will contribute to the growth and spread of fire within the assemblies, which could lead to the structural failure and collapse of the assemblies, which could lead to damage to the building.
To limit the probability that certain service equipment that penetrates fire-rated assemblies that also form a fire separation will contribute to the growth and spread of fire within the assemblies, which could lead to a loss of integrity of the assemblies, which could lead to the spread of fire and smoke from one fire compartment to another, which could lead to damage to the building in the other compartment.