Home Services Contact Us Products Rates Specials Employees Testimonials References Job Opportunities Fire Industry News Fire Industry Links How Does It Work ? FAQs In Case Of Fire Training How Does It Work? Fire Extinguisher Sizes Portable extinguishers are also rated for the size of fire they can handle. This rating is expressed as a number from 1 to 40 for Class A fires and from 1 to 640 for Class B fires. This rating will appear on the label-- 2A:10B:C, for example. The larger the numbers, the larger the fire of a specific class on which the extinguisher can be used (but higher-rated models are often heavier - make sure you can hold and operate an extinguisher before you buy it). No number accompanies an extinguisher's Class C rating. The C on the label indicates only that the extinguisher is safe to use on electrical fires. Extinguishers for Class D fires must match the type of metal that is burning. These extinguishers do not use numerical ratings. Extinguishers for Class D fires are labeled with a list detailing the metals that match the unit's extinguishing agent. Back to How Does It Work PO Box 725 . Suisun City . CA . 94585 . 707-429-5323 . License # C16- 672421   Please call our office for large order discounts! Web Specials