What is a system installed in a specific area for a specific purpose within a building called?

A system installed in a specific area for a specific purpose within a building is appropriately referred to as a sub-system. This term is used to describe smaller, specialized systems that operate as part of a larger system. In the context of fire safety and alarm systems, a sub-system could handle functions like smoke detection or alarm signaling specifically for one area, while still being part of the overall fire alarm system for the entire building.

Sub-systems allow for more tailored response and management of fire safety features, catering to the specific needs and regulations of different areas within buildings, especially in complex environments like homeless shelters where each area might have different requirements based on usage and occupancy.

Other options, while related to fire safety and alarm systems, do not convey the idea of a specific localized system. A fire panel manages the overall system but is not limited to a particular area, evacuation systems focus on the actions taken during a fire event, and a fire detection network refers to the interconnected nature of detection devices across a broader spectrum rather than individual areas.