Stored pressure water extinguishers are intended for which class of fire?

Stored pressure water extinguishers are designed specifically for Class A fires, which involve ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics. The effectiveness of these extinguishers lies in their ability to cool and quench the fire by soaking the burning materials, removing the heat component of the fire triangle.

Class A fires require a water-based suppression method, as water cools and helps prevent the fire from reigniting. The stored pressure design allows for quick deployment and immediate use, making them effective for tackling these types of fires in certain environments, such as residential or light commercial settings.

On the other hand, Class B fires involve flammable liquids and gases, which can be exacerbated by water since it may spread the fire. Class C fires involve energized electrical equipment, where using water would pose a risk of electrical shock. Class K fires, associated with cooking oils and fats, typically require special extinguishing agents designed to combat high-temperature grease fires. Therefore, the suitability of stored pressure water extinguishers is confined to Class A fires only, affirming the selection of this answer.