When used in reference to fire extinguishers, what does the term travel distance mean?

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Travel distance is about how far people must walk to reach an extinguisher that can actually handle the fire hazard present. The best choice describes the walking distance from any point to the nearest extinguisher that meets the hazard requirement, which is exactly what accessibility rules aim to ensure.

This matters because an extinguisher that isn’t appropriate for the fire type doesn’t help in an emergency, and the distance must be short enough so someone can grab the right extinguisher quickly. The other options describe unrelated ideas: how far the extinguishing agent can reach when discharged, how far apart extinguishers are mounted, or how far to an exit, none of which define travel distance for extinguishers.