Which fire containment class requires a separate approved smoke detector or fire detector system and allows crew access with a handheld fire extinguisher?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (B)

Fire containment classifications describe how a compartment is protected against different fire types, including how fires are detected and how they are fought. For a Class B containment, which involves flammable liquids, the design includes a separate approved smoke detector or fire detector system specific to that space. This dedicated detection provides early warning tailored to the area where a flammable-liquid fire could occur, which is crucial for quick, targeted response. At the same time, the system is designed so crew can access the space with a handheld fire extinguisher to begin suppression immediately if a small fire is detected. This combination—independent detection for fast warning plus allowing manual intervention by the crew—fits the typical risk profile of Class B fires in confined compartments. Other classes rely more on general or fixed-detection and may restrict crew access due to different fire risks or design constraints, so they don’t align with this specific setup.