Fire extinguishers are labeled with a letter and a number. The letter indicates the type of fire that the extinguisher is designed to fight. The number indicates the size rating of each extinguishing agent. The size rating represents the water equivalency. Each number represents 1 ¼ gallons of water.
For example, if you come across a fire extinguisher labeled 4A:20B:C, the Class A size rating represents the water equivalency. Each number represents 1 ¼ gallons of water. The numbers preceding the letters on the label indicate just how much fire the extinguishing agent can put out.
Fire extinguishers are classified by a number and letter symbol. The number indicates the relative size of the extinguisher, and the letter indicates the type of fire it will extinguish.
Here are some websites that discuss All Fire Extinguishers Are Labeled With A Letter And A Number. What Does The Number Indicate?:
- [Guardian Fire Protection](https://www.guardianfireprotection.com/blog/numbers-fire-extinguisher/)
- [QRFS.com](https://blog.qrfs.com/207-what-does-the-number-on-a-fire-extinguisher-mean/)
- [Boat Ed](https://www.boat-ed.com/ohio/studyGuide/Types-of-Fire-Extinguishers/10103602_42848/)
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