NFPA ___________ is the standard on carbon dioxide extinguishing systems.

• A. NFPA 13
• B. NFPA 12
• C. NFPA 20
• D. NFPA 25

Answer: (B)

The main idea here is that carbon dioxide extinguishing systems have their own dedicated NFPA standard that guides how they’re designed, installed, and maintained because CO2 is a toxic agent and must be handled with strong safety measures. The standard for carbon dioxide extinguishing systems provides the requirements for system types, agent properties, space suitability, discharge planning and timing, detection and control interlocks, piping, nozzles, alarm procedures, and ongoing testing and maintenance. It also addresses safety considerations for occupied spaces, such as warning and evacuation requirements or alternatives to ensure occupant safety during system actuation.

This standard differs from others that cover different fire protection methods: the standard for sprinkler systems that use water, the standard for installing fire pumps, and the standard for inspecting and maintaining water-based systems. Knowing which standard applies helps you properly design and evaluate systems while accounting for the unique hazards and safety measures associated with each extinguishing method.