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 sweep the nozzle side to side, there is enough extinguishing agent inside the canister to provide 20 square feet of coverage.
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.
What is a 2a rated fire extinguisher? – FindAnyAnswer.com
Every fire extinguisher has an alphanumeric rating that tells you what types of fires it can extinguish as well as the size of fire it can put out. For example, 2A means the fire extinguisher is as effective as 2 ½ gallons of water, and so on.
The numbers in front of the letters represent the relative amount of that type of fire which the extinguisher will put out. So a 2A 40BC fire extinguisher will put out 4 times more of a “B” fire (flammable liquid) than a 2A 10BC fire extinguisher.
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What does 2A 10BC mean on a fire extinguisher?
What is an “ABC” fire extinguisher and what do the numbers 2A 10BC mean? Fires are categorized into 4 groups: A, or common combustible fires (including burning paper, wood, etc.); B, or flammable liquid fires (gasoline, cooking oil, etc.); C, or electrical fires; and D, which are flammable metal fires (including magnesium, sodium, etc.).
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 class a mean on a fire extinguisher?
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.
What is the difference between BC and ABC fire extinguishers?
An “ABC” fire extinguisher would be effective on those three types of fires. However, a “BC” fire extinguisher would not be very effective on A-type fires such as burning paper. “D” fires are not very common and “D” extinguishers are not usually sold for home use.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher