Which classes of fires are CO2 extinguishers suited for?

CO2 extinguishers are specifically designed to combat Class B and Class C fires. Class B fires involve flammable liquids, gases, and greases, while Class C fires involve energized electrical equipment. The CO2 extinguisher works by displacing oxygen, which is a crucial element for combustion, thereby suffocating the fire. It does not leave any residue, making it especially suitable for fires involving electrical equipment, as it does not conduct electricity.

In contrast, Class A fires involve ordinary combustibles like wood, paper, and textiles, which do not benefit from CO2 extinguishment as effectively as from water-based or foam extinguishers. Class K fires, related to cooking oils and fats, require specialized extinguishing agents that are better suited for those unique fire hazards. Therefore, the correct pairing of CO2 extinguishers with Class B and C fires emphasizes their effective use in addressing flammable liquids and electrical hazards, making them a crucial tool in a firefighter's arsenal.