When should the application rate of class B foam be adjusted?

The application rate of Class B foam should be adjusted based on the size and type of fire because different fires require different levels of foam application to effectively suppress them. For instance, a large, rapidly spreading hydrocarbon fire would necessitate a higher application rate to ensure sufficient coverage and control of the fire, while a smaller or less volatile fire might require less foam. Additionally, different fuel types (such as polar and non-polar solvents) may react differently to foam, impacting the effectiveness of the suppression effort. Therefore, being aware of the specific conditions and characteristics of the fire allows firefighters to make informed decisions about how much foam to apply for optimal results. This approach enhances safety and improves the chances of successfully extinguishing the fire.