🔍 Key Concepts

• Class B fires involve flammable liquids such as fuel oil, gasoline, and lube oil • How different extinguishing agents work: CO₂, dry chemical, and foam • Engine compartment constraints: confined space, machinery, and possibility of re-flash

💭 Think About

• Think about which agents remove oxygen, which interrupt the chemical reaction, and which smother and cool flammable liquids • Consider what is commonly used in fixed fire-extinguishing systems in engine rooms versus what you’d use as a portable extinguisher • Ask yourself: are any of these agents specifically not recommended for flammable liquid fires in machinery spaces? If so, which?

✅ Before You Answer

• Verify what agents are listed for Class B fires on standard fire extinguisher labels (e.g., B:C, A:B:C, etc.) • Consider which agents are used in engine-room fixed systems per SOLAS/USCG guidance (e.g., CO₂, foam systems) • Make sure the option you choose is consistent with both class B rating and engine compartment suitability (confined space, machinery, ventilation)