To limit the probability that fire will spread from a service room containing a fuel-fired appliance to other parts of the building, which could lead to harm to persons in the other parts of the building.
To limit the probability that a fire originating in a location outside a service room will spread into the service room, which could lead to disruption and discontinuation of service from equipment located in the service room, which could lead to an undue fire hazard in the building, which could lead to harm to persons.