Reference

Fire extinguisher classes (A, B, C, D, and K) tell you which fires a unit can safely fight, and using the wrong class can spread a fire instead of stopping it. This guide decodes every class under NFPA 10, explains the numerical A and B ratings on the label, covers the PASS discharge method, and walks a worked example of equipping a workshop.

Most workplace fires start small enough to stop with a portable extinguisher, but only when you pick the right class and use it correctly. This guide explains the PASS method step by step, decodes fire classes A through K, walks through a real ABC unit, and covers the OSHA training rule and when to evacuate.