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 determines the number of fire extinguishers required? The number identifies the amount of firefighting agent that the fire extinguisher has: The greater the number, the more fire-fighting agent in the extinguisher (for example, a Class 3 fire extinguisher can put out a larger fire than a Class 2 extinguisher).
#207 – What Does the Number on a Fire Extinguisher Mean?
As part of a fire extinguisher’s classification, the numbers on the label can mean either: How much water would be required to match the agent’s power against Class A fires. The square footage of Class B fires the agent can extinguish. For each A, the extinguisher contains the equivalent of 1.25 gallons of water.
The typical home fire extinguisher available at the home center is marked with a series of numbers and letters to indicate what type and how large of a fire the extinguisher can be used on. The letters indicate the type material the extinguisher can be used on; A for combustible solids (paper, wood and trash), B for combustible liquids (gasoline, oil, acetone) …
People Also Ask what does a number on a fire extinguisher indicate
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 “C” mean on a fire extinguisher?
The letter “C” indicates only that the fire extinguisher uses an agent that doesn’t conduct electricity. Water-based and some foam extinguishers can’t fight Class A or Class B fires involving electrical equipment (thus, no “C” on the label). But extinguishers that use inert gases and various powder mixtures can, meaning they have an “A:B:C” rating.
What does 2A mean on a fire extinguisher?
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 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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TYPES OF FIRE AND FIRE EXTINGUISHERS | WHICH FIRE EXTINGUISHER TO BE USED ON WHICH CLASSES OF FIRE Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher