The most commonly used extinguishers by their ratings and weight. 2-A:10B:C – 4 lb. 3-A:40B:C – 5 lb. 4-A:60B:C – 10 lb. 10-A:80B:C – 20 lb. No number accompanies a fire extinguisher’s Class C rating. The C on the label indicates only that the extinguisher is safe to use on electrical fires.
How big of a fire extinguisher should I get? A 2 ¾ to 5 lb extinguisher has a 5-20 foot horizontal stream range and will discharge for 8-20 seconds. In general, a 5lb or larger dry chemical extinguisher is recommended for general use in an office building, small shop or vehicle.
How long does a 5 lb fire extinguisher last? – Quora
Answer: When you purchase a new carbon dioxide, pressurized water, or wet chemical extinguisher, you can expect it to last at least five years. For dry chemical extinguishers, the minimum lifespan is 12 years. It’s at these intervals that the National Fire Protection Association (NFPA) requires …
As a rule of thumb, extinguishers typically last 5 to 15 years. How long does a fire extinguisher spray last? The approximate discharge time for 10 to 20 pounds of dry chemical ranges from 10 to 25 seconds.Once activated, can an ABC extinguisher be turned off?
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher