For which building system plans should the type of expellant gas and storage container size be documented?

• A. Electrical diagrams
• B. Special-agent fire extinguishing
• C. Plumbing layouts
• D. Fire alarm system

Answer: (B)

The requirement to document the type of extinguishing agent and the storage container size lives with special-agent fire extinguishing system plans. These systems rely on stored chemical agents in pressurized cylinders, so the drawings must specify exactly which agent is used and how much is stored to enable proper design, concentration calculations, placement, safety, and maintenance. The agent type affects toxicity, reactivity, and compatibility, while container size determines the total quantity, discharge characteristics, and coverage. Electrical diagrams, plumbing layouts, and fire alarm system plans cover circuits, piping for water, or detection/alert functions, not the specifics of a stored extinguishing agent, so they don’t require these details.