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Fire extinguishers often can come with a combination of ratings, for example it’s pretty common to see an ABC rated fire extinguisher that is ok to use on ordinary combustibles, flammable liquids and energized electrical equipment.
The letter on a fire extinguisher indicates its classification: Class A puts out ordinary combustible fires (wood, paper, plastic, etc.) Class B puts out flammable liquid fires (oil, gas, petroleum, etc.) Class C puts out electrical fires.
UL Rating guide for Choosing a Fire Extinguisher. All Fire Extinguishers are tested by the Underwriters Laboratory for safety and performance. They are rated based on the type of fire that they will put out, and their classification is determined by the size of fire they will put out.
Fire extinguisher ratings can help you find the right extinguisher for your home. Learn how to read the label and more in this article.
Understanding Fire Extinguisher Ratings. The numbers on fire extinguishers indicate their size and effectiveness. This numerical rating helps users understand how much fire the extinguisher can handle. Class A Ratings. For Class A fires, the number before the “A” indicates the extinguisher’s effectiveness relative to 1 ¼ gallons of water.
Extinguishers that have attained "A" ratings but lack "B", "C", or “K” ratings are limited to ordinary combustible fires and should not be used to fight liquid based fired, energized electrical fires, or kitchen based fires.
The numbers on fire extinguishers are a rating system used to indicate the extinguishing power of the extinguisher. The rating system is based on the amount of fire-fighting agent the extinguisher contains and the size of the fire it can extinguish.
The letter on a fire extinguisher indicates its classification: Class A puts out ordinary combustible fires (wood, paper, plastic, etc.). Class B puts out flammable liquid fires (oil, gas, petroleum, etc.). Class C puts out electrical fires.
Fire extinguishers are classified by the types of fires they can effectively combat, indicated by the letters A, B, and C. A – For ordinary combustibles like paper, wood, and cloth (think "A for Ash"). B – For flammable liquids such as gasoline, oil, and grease (think "B for Barrel").
In this article, we explain what the numbers (and letters) on a fire extinguisher mean and what they indicate about its suitability against certain types of fires. We’ll cover the basics, look at a few examples, and detail the tests used to arrive at these conclusions.