Why is it critical to aim a Type B extinguisher at the base of the fire?

Aiming a Type B extinguisher at the base of the fire is crucial because this is where the fuel that is feeding the fire is located. Fires can spread quickly, and targeting the base allows the extinguishing agent to directly engage with the source of the flames, effectively disrupting the combustion process.

When the extinguishing agent is applied at the base, it can more effectively smother the flames by cutting off the fire's access to oxygen and cooling the fuel. This approach helps ensure that the fire does not re-ignite as the fuel is adequately treated. In contrast, aiming at the flames or upper portions of the fire does not address the underlying source of the fire, making it less effective in extinguishing it.

Understanding this technique is key for effective fire extinguishing practices, especially with Type B extinguishers, which are designed specifically to handle flammable liquids and gases.