Where should you aim the nozzle of a fire extinguisher according to the PASS technique?

Aiming the nozzle of a fire extinguisher at the base of the fire is crucial for effectively extinguishing flames. This is because fires burn upward, and the fuel source is typically located at the base. By targeting the base, you directly address the most critical part of the fire, allowing the extinguishing agent to smother the flames and cut off their oxygen supply effectively.

When the nozzle is aimed at the flames directly, the extinguishing agent may not reach the fuel, which is necessary for stopping the fire. Similarly, aiming at smoke or the ceiling is ineffective since it does not impact the source of the fire or the burning material itself. Proper fire extinguisher technique emphasizes not just extinguishing visible flames but also addressing the source of the fire to prevent re-ignition and ensure a safer environment.