Which type of agent is used to extinguish a Class K fire?

Class K fires involve cooking oils and fats, typically found in commercial kitchens. The ideal agent for extinguishing these types of fires is a wet chemical. Wet chemical agents are effective because they cool the flames while also creating a coating that smothers the fire and prevents re-ignition. This coating process is particularly important because cooking oils can easily reignite if they're not properly extinguished.

Water is ineffective and potentially hazardous in Class K fires due to the risk of splattering hot oil, which can spread the fire. Dirt and foam are also not suited for Class K fires; they either fail to provide the necessary cooling effect or do not create the protective layer needed to mitigate the re-ignition risk associated with heated oils. Therefore, wet chemical agents specifically designed for Class K fires are the safest and most effective choice for extinguishing these kinds of flames.