Which of the following is NOT a class of fire?

Class V fires is not recognized as an established classification within the fire classification system. Fire classifications are typically grouped into several main categories based on the types of materials that fuel the fire.

Class A fires involve ordinary combustible materials such as wood, paper, and textiles. Class B fires relate to flammable liquids and gases, like gasoline and oil. Class K fires are specific to cooking oils and greases, often encountered in commercial kitchens. Each of these classes has specific firefighting methods and extinguishing agents suited to the materials involved.

Since Class V fires does not exist within these classifications, it correctly identifies the option that is not a recognized class of fire. This reflects differences in the classification system aimed at effectively addressing and managing fire hazards.