NFPA Portable Fire Extinguishers (NFPA 10) Practice Exam 2026 – Comprehensive All-in-One Resource for Exam Success!

In determining the suitable extinguishers for Class B hazards, it's important to understand what Class B fires involve. Class B fires are fueled by flammable liquids such as gasoline, oil, grease, and other similar substances.

Aqueous film-forming foam (AFFF) is designed specifically to combat flammable liquid fires. It works by creating a film that suffocates the fire and prevents the flammable vapors from igniting, making it highly effective against Class B hazards.

Carbon dioxide (CO2) extinguishers are also suitable for Class B fires. They work by displacing oxygen in the surrounding area, which is necessary for combustion, and they do so without leaving any residue, making them ideal for use in environments where equipment could be damaged by other agents.

Wet chemical extinguishers, on the other hand, are designed primarily for Class K fires, which involve cooking oils and fats. While they are not recommended for Class B fire hazards, they can still extinguish fires that might involve grease if they are involved in a kitchen scenario. However, they are not typically classified as suitable for general Class B incidents.

Given that both aqueous film-forming foam and carbon dioxide extinguishers are effective for Class B hazards, the