Where should a security guard aim the nozzle of a fire extinguisher?

Aiming the nozzle of a fire extinguisher at the base of the flames is the correct technique for effectively extinguishing a fire. This approach focuses on addressing the source of the flames, where the combustible materials are located, thereby interrupting the fire's fuel source.

Fires need three elements to sustain themselves: heat, fuel, and oxygen—known as the fire triangle. By directing the extinguishing agent at the base of the flames, the guard can effectively remove one or more of these elements, particularly by cooling the fuel and displacing oxygen. This method is more efficient than aiming at the flames themselves, as extinguishing agents need to hit the material that is actually burning to be effective.

Aiming at the top or edges of the flames does not effectively combat the fire's source and may lead to a return of the flames since the fuel remains unaddressed. Therefore, aiming at the base ensures that the guard is targeting the most critical area to put out the fire effectively.