What is the primary duration of an AFFF extinguisher?

The primary duration of an AFFF (Aqueous Film Forming Foam) extinguisher is designed to provide effective suppression of flammable liquid fires for a specific period, which is typically around 55 seconds. This duration is based on the necessity to ensure that the foam can effectively blanket the fuel surface, suppress vapors, and create a barrier between the fire and the environment, thus allowing for efficient firefighting measures and enhancing safety.

Understanding the role of the AFFF expulsion time is crucial for users in firefighting situations, as it can influence their strategy for combating fires. Having approximately 55 seconds of discharge allows personnel sufficient time to manage the fire adequately or evacuate when necessary. Other times listed in the choices do not align with the standard specifications for AFFF extinguishers, emphasizing that the correct answer reflects the operational readiness and effectiveness of these firefighting tools.