How much of their contents must other extinguishers be able to discharge?

The correct answer is that other extinguishers must be able to discharge 95% of their contents. This regulation ensures that fire extinguishers are effective and capable of putting out or controlling a fire before it can spread and cause further damage.

Discharging a high percentage of their contents is essential for extinguishers to be effective, as it allows for a greater quantity of the extinguishing agent to be applied to the fire. A requirement of 95% ensures that the majority of the agent is available for use, maximizing the chances of successfully extinguishing a fire.

This standard helps to ensure that when required, the extinguishers are not only capable of discharging a significant amount of their agent but also that they are reliable and consistent in performance. It reflects the expectation that fire extinguishers should function effectively in emergencies, thereby enhancing safety and reducing risk in environments where fire hazards are present.