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 …
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. …
Need Help Understanding Fire Extinguisher Ratings? – Angi
For the A-rating, the number indicates the water equivalency of the powder in the extinguisher. In our example above, the 4 represents 5 gallons. A …
What do the ABC ratings mean on fire extinguishers? 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, …
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Fire Extinguisher UL Rating & Placement as per NFPA 10 Part 1 English Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher