🔍 Key Concepts

• Fire classes and fuel types (what burns in class A, B, C, D, E) • How CO₂ works as an extinguishing agent (oxygen displacement, no cooling, non‑conductive gas) • When water is dangerous (especially around liquids and electrical equipment)

💭 Think About

• Which fire classes involve ordinary combustibles, flammable liquids, electrical equipment, metals, etc.? Match these to where a gas that displaces oxygen (CO₂) would be effective. • In which situations is it important that the extinguishing agent is non-conductive and leaves no residue? • For each option, ask yourself: Is CO₂ generally recommended, acceptable with limitations, or specifically not recommended for that fire class?

✅ Before You Answer

• Be clear on what Class A, B, C, D, and E each represent in standard marine/firefighting terminology. • Ask: Does CO₂ provide enough cooling for that class, or does it mainly just remove oxygen? Where is that acceptable or unsafe? • Check which classes typically require special agents (like dry powder or foam) instead of CO₂ as the primary choice.