The letters A, B, and C refer to Classes of Fire established by UL and NFPA.
The letters shown on the label of the fire extinguisher indicate that it has been tested and found to be effective on those classes of fires.
Class A: Fires that involve common combustibles such as wood, paper, cloth, rubber, trash, and plastics.
Class B: Fires that involve solvents, oil, gasoline, paints, lacquers and other oil-based products.
Class C: Fires that involve energized electrical equipment.
Class D: Fires that involve combustible metals such as magnesium, lithium, and titanium.
Class K: Fires that involve combustible cooking media such as oils and grease commonly found in commercial kitchens.
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