Why is it important to aim at the base of a fire when using an extinguisher?

Aiming at the base of a fire is crucial because it directly targets the fuel source that is igniting the flames. By doing so, you can extinguish the fire more effectively, as this is where the heat, fuel, and oxygen converge to sustain combustion.

When you spray the extinguisher at the flames themselves, you may be dispersing the fire's heat but potentially missing the underlying fuel, which can allow the fire to continue. Concentrating on the base disrupts the fire’s ability to draw in adequate oxygen and cools the fuel, leading to a more successful extinguishing process. This method maximizes the efficacy of the extinguishing agent being used, ensuring that it has the best chance to control the flames and prevent them from re-igniting.