Which foam concentration is generally more effective for Class A fires compared to Class B?

The most effective foam concentration for Class A fires compared to Class B is typically around 0.25%. This lower concentration is specifically designed for combating fires involving ordinary combustibles, such as wood, paper, and textiles. Class A fires benefit from aqueous film-forming foams that enhance water retention, allowing the foam to penetrate and cool the burning materials effectively, preventing re-ignition.

Higher concentrations might not necessarily provide additional benefits for Class A fires, as they may lead to excessive residue or foam blanket that doesn't enhance extinguishment. Therefore, the recommended 0.25% concentration strikes an optimal balance for effective suppression while maintaining operational efficiency.

Understanding foam types and their specific applications is crucial for fire response, ensuring that firefighters can efficiently and effectively target the type of materials involved in the fire.