What is the most common type of multi-purpose fire extinguisher used?

The most common type of multi-purpose fire extinguisher used is the dry chemical extinguisher. These extinguishers are effective against multiple types of fires, specifically Class A (ordinary combustibles), Class B (flammable liquids), and Class C (electrical equipment) fires. The dry chemical agent typically used is monoammonium phosphate, which works by interrupting the chemical reaction of the fire, cooling the surface, and forming a barrier between the fuel and the oxygen in the air.

Their versatility and effectiveness in a wide range of fire scenarios make dry chemical extinguishers a popular choice for homes, businesses, and vehicles. The ability to combat different classes of fires with one extinguisher helps reduce the need for multiple types, providing convenience and safety in emergency situations.

In contrast, other types such as aqueous film-forming foam are effective mainly on flammable liquids, wet chemical extinguishers are primarily for cooking oils and fats, while carbon dioxide extinguishers are mainly used for electrical fires and do not leave residue, limiting their use in many everyday scenarios. This distinction highlights why dry chemical extinguishers are favored for their broad applicability and overall reliability in tackling various fires effectively.