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. The Class B size rating indicates the square footage the extinguisher can cover. 20B means that as long as you …
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. Clean Agent Fire Extinguisher: This fire extinguisher is best suited for Class B and C fires.
Understanding Fire Extinguisher Ratings – HSEWatch
The A, B, C rating system defines the kinds of burning materials each fire extinguisher is designed to fight. The number in front of the A, B, or C indicates the rating size of fire the unit can extinguish. Located on the fire extinguisher label is the UL rating (Fire Extinguisher Ratings). The UL rating is broken down into Class A and Class B …
Class K Fire extinguishers are have been rated to be used on Kitchen fires involving cooking oils and deep fryers. Class K are not given a numerical rating. • Example: A Fire Extinguisher with a rating of 2A:K would contain the equivalent to 2.5 gallons of water (2 x 1.25) and would also be approved to be used on a Class K (cooking oil) Fire.
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What do the ratings on a fire extinguisher mean?
Located on the fire extinguisher label is the UL rating (Fire Extinguisher Ratings). The UL rating is broken down into Class A and Class B:C ratings. These numerical ratings allow you to compare the relative extinguishing effectiveness of various fire extinguishers.
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 is a Class B fire extinguisher?
The numerical rating for a class B fire extinguisher refers to the number of cubic feet that the Fire Extinguisher will be able to extinguish. • Example: A Fire Extinguisher with a rating of 1A:10B:C would contain agents equal to 1.25 gallons of water (1 x 1.25) and would be able to extinguish 10 square feet of a class B fire.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher