What type of fire can APC primarily smother?

The correct answer is that APC, or Aqueous Film Forming Foam, primarily smothers deep fat fryer fires. These types of fires can occur when cooking oils and fats reach their flash point, igniting and causing a potentially dangerous situation. When APC is applied to such fires, it creates a barrier between the fuel and the oxygen in the environment, effectively smothering the fire and preventing it from spreading. In the context of fire suppression, the ability of a fire extinguishing agent to not only cool but also separate the fuel from the air is critical for extinguishing deep fat fryer fires.

Other types of fires mentioned, such as wood and paper fires, electrical fires, and flammable liquid fires, may require different methods or agents for effective suppression. For example, water is effective on wood and paper fires but could be dangerous on flammable liquid fires or electrical fires, where specialized agents are often needed to prevent spreading or conducting electricity. The unique properties of APC make it particularly suited for the specific challenges presented by deep fat fryer fires, emphasizing its role in effective damage control practices.