When directing dry chemicals on a fire, how should the chemicals be applied?

Applying dry chemicals at the base of the fire while sweeping the nozzle back and forth is the most effective technique. This approach targets the fuel source directly, which is essential for extinguishing flames. When you aim at the base, you disrupt the combustion process more effectively by cutting off the fire's access to its fuel and heat, which are necessary components of the fire triangle.

By sweeping the nozzle back and forth, you ensure that the chemical agent is evenly distributed across the burning material, maximizing the impact of the chemical and helping to form a suffocating layer over the fire. This method not only helps to extinguish the flames but also prevents re-ignition by cooling the hot surfaces and reducing the release of flammable vapors from the fuel.

Other methods, such as applying from a distance or directing chemicals at the center or the fuel pool, may not adequately address the fire at its source, making them less effective in controlling and extinguishing the blaze.