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.
What do the Numbers on Fire Extinguishers Mean? 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 class A fires, the number corresponds to its effectiveness relative to 1 ¼ gallons of water.
All about marine fire extinguishers – America’s Boating …
Next, look for the section of the label that states “Marine Type USCG, Type A, Size II; Type B; C Size I.”. (It should also contain a USCG approval number.) Make sure Type B is indicated on the label. However, extinguisher markings can be confusing. For example, one extinguisher can be approved for several different types of fires (A, B, or C).
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 class A fires, the number corresponds to its effectiveness relative to …
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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 do the different extinguisher markings mean?
However, extinguisher markings can be confusing. For example, one extinguisher can be approved for several different types of fires (A, B, or C). In that case, it’s important to know that an extinguisher marked “Type A, Size II; Type B; C, Size I” counts as a required Type B-I extinguisher.
How many fire extinguishers do I need for my Boat?
The minimum number of portable extinguishers you’re required to carry depends on your boat’s length. However, if you have a U.S. Coast Guard-approved fixed fire extinguishing system installed in your boat’s engine compartment, you can reduce the required number of extinguishers using the chart below. Do I need a fixed extinguisher system?
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.
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Buyer's Guide to Marine Fire Extinguishers Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher