A local application system shall consist of which configuration?

• A. A fixed supply of clean agent permanently connected to a system of fixed piping with nozzles arranged to discharge directly into the fire
• B. A portable bottle system used for small localized fires
• C. A system with open circulation into the room
• D. A water-based sprinkler network

Answer: (C)

Local application systems are designed to apply clean agent directly to a specific hazard area using a fixed piping network with discharge nozzles, and the agent is allowed to diffuse through the space by open circulation rather than flooding a sealed room. This open circulation into the room is characteristic of a local application configuration, because it distributes the agent through the room to reach the fire without requiring complete enclosure or a dedicated closed-loop volume. The other configurations fall outside this concept: directing agent straight into the fire implies a targeted, non-distributed approach rather than leveraging room circulation; portable bottle systems are not fixed, engineered local application installations; and a water-based sprinkler network uses water, not a clean agent.