Which extinguisher utilizes saponification to extinguish Class K fires?

The stored-pressure wet chemical extinguisher is the correct choice for extinguishing Class K fires, which typically involve cooking oils and fats. Saponification is a chemical reaction that occurs when certain substances interact with fats and oils. In the context of Class K fires, the wet chemical agent in these extinguishers, which is usually a potassium-based solution, reacts with the cooking oils to create a soapy film. This film effectively seals the surface of the burning material, preventing oxygen from fueling the fire and effectively extinguishing it.

This method is particularly important for Class K fires because traditional fire extinguishing agents might not be effective or could potentially spread the fire further. The wet chemical extinguishers are specifically designed for the unique characteristics of these fires, highlighting the significance of using the right type of extinguisher in fire scenarios involving cooking oils.