How to Understand Fire Extinguisher Ratings

Instructions

Realize that fire extinguisher ratings are determined based on tests that laboratories conduct and that ratings are used to estimate the extinguishing potential for each Class A or B fire extinguisher.

Understand that the rating that a Class B extinguisher shows states the approximate number of square feet of a flammable liquid fire that a nonexpert person can expect to extinguish. You find Class B extinguishers with ratings such as 1-B, 2-B, 5-B, 10-B, 20-B, 30-B, 40-B and up to 640-B. A 40-B extinguisher, for example, is effective for putting out a flammable liquid fire covering up to 40 square feet.

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