What is meant by total flooding in SHS?

• A. A system that floods only the room with water
• B. A design that uses local application near the fire
• C. A design approach where the extinguishing agent is released to fill the entire volume of a defined enclosure to reach a specified design concentration and deactivate the fire
• D. A design that uses agent to protect only equipment

Answer: (C)

Total flooding means releasing the extinguishing agent so it fills the entire defined enclosure, reaching a specified design concentration throughout the space to reliably extinguish the fire. The idea is to distribute the agent uniformly to the whole volume, not just a spot near the fire, so the fire is deactivated by the agent’s required concentration and action (whether by cooling, chemical inhibition, or other mechanism depending on the agent). The design concentration is calculated from the enclosure size and the agent’s performance, ensuring the space reaches and maintains that level long enough to stop the fire. This is the hallmark of a total flooding SHS: the entire volume is flooded, rather than applying agent locally or protecting only equipment or a single room.