The numbers indicate the size rating of each extinguishing agent. Here’s how it works: The Class A size rating represents the water equivalency. Each number represents 1 ¼ gallons of water. For instance, 2A means the extinguisher is just as effective as 2 ½ gallons of water. 4A is equivalent to 5 gallons of water.
Year to date made – Fire Extinguisher. The numbers you might see accompanying the letter class of a fire extinguisher refer to the extinguishers size rating for class A and B fires. Other classes don’t have such a rating. For …
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5. Foam Fire Extinguisher: The foam in this extinguisher works best on class A and B fires, but it’s not suitable for gaseous fires. The foam blankets the fire, which prevents vapors from rising and cools the surface. 6. …
The number before the B indicates the area of the liquid spill, which is burning, that the extinguisher can extinguish. A 1B rating would extinguish a 2.5 square foot liquid fire and a 2B would extinguish a 5 square foot liquid fire. The area increases by 2.5 square foot for each whole number in crease in the rating.
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What do the numbers on a fire extinguisher mean?
Since Class A, B, and C fires are all found in conventional homes and businesses, ABC fire extinguishers are designed to put out all three types of fires. You might come across a fire extinguisher labeled 4A:20B:C. The numbers indicate the size rating of each extinguishing agent.
What does 4A 20B C mean on a fire extinguisher?
You might come across a fire extinguisher labeled 4A:20B:C. The numbers indicate the size rating of each extinguishing agent. Here’s how it works: The Class A size rating represents the water equivalency.
What do fire extinguisher classes and size ratings mean?
To ensure you buy the right type and size for the application you have in mind, learn more about fire extinguisher classes and size ratings. 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.)
What does 3A mean on a fire extinguisher?
For class A fires, the number corresponds to its effectiveness relative to 1 ¼ gallons of water. If you see an extinguisher with “3A” that means it would be as effective as using 3 ¾ gallons of water on the fire.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher