Is the system used to rate the effectiveness of extinguishers applicable to pressurized flammable liquids for Class B fires?

The statement that the system used to rate the effectiveness of extinguishers is not applicable to pressurized flammable liquids for Class B fires is correct because Class B fire extinguishers are specifically designed for use on fires involving flammable liquids and gases. The effectiveness of an extinguisher is evaluated based on its ability to suppress such fires, considering factors like the type of liquid involved and the combustion properties.

Flammable liquids under pressure can behave differently and require specific extinguishing agents to address the unique challenges they present. Rating systems typically focus on extinguishers designed for specific classes of fires, and while certain extinguishers may be approved for a broader range of flammable liquids, the unique nature of pressurized products necessitates specialized handling and may not conform strictly to standard rating criteria.

In addition, many commonly used extinguishing agents may not effectively suppress fires involving certain pressurized flammable liquids, thereby limiting the relevance of the general rating system in these cases. Hence, understanding the limitations of the general rating system is essential for effective fire safety and response in situations involving Class B fires.