🔍 Key Concepts

• Fixed gas fire-extinguishing systems in machinery spaces (like Halon 1301 or CO₂) • What happens if engines and ventilation are left running during a gas flooding operation • How gas agents actually extinguish fires (displacing oxygen / interrupting chemical reaction, not cooling metal or being absorbed by cooling water)

💭 Think About

• If a gaseous agent is released into an engine room, what parts of the machinery or ventilation could remove that gas from the space before it reaches effective concentration? • Which option describes a situation that would directly reduce the Halon concentration in the engine room and therefore prevent it from putting out the fire? • Think about the air path: where does combustion air go, and what happens to anything mixed in that air if the engine keeps running?

✅ Before You Answer

• Check which choice directly affects the concentration of Halon in the engine room and its ability to stay in the space long enough to extinguish the fire. • Eliminate any options that confuse Halon with a liquid coolant or something that is ‘absorbed’ like water. • Remember standard procedures: engines, fuel, and ventilation are normally shut down before or during a fixed gas system discharge—focus on the answer that matches that concern.