What type of nozzle is recommended for using Class B foam effectively?

Using a fog nozzle is recommended for effectively applying Class B foam due to its ability to create a fine mist or spray. This mist enhances the mixing of foam concentrate with water and allows for better coverage over flammable liquid spills. The fog pattern generated by this type of nozzle helps to blanket the surface of the flammable liquid, which is essential for effective fire control and suppression, as it prevents the release of flammable vapors and effectively cools the burning material.

In contrast, solid bore nozzles produce a straight stream of water without the benefit of foam expansion or dispersion, which is not ideal when trying to maximize the effectiveness of foam agents. Combination nozzles can restrict the ability to properly apply foam, as they may not achieve the optimal foam quality needed for Class B fires. Low flow nozzles might not deliver sufficient foam volume or coverage to adequately extinguish larger fires involving flammable liquids. Therefore, a fog nozzle is the most suitable choice for effective Class B foam application in firefighting scenarios.