07/19/2023
Before using a fire extinguisher, it is important to know what type(s) of fire the extinguisher is rated for. Some fire extinguishers are only rated for a single type of fire (Class A, Class B, or Class D), but most fire extinguishers are rated for a combination of fires (Class AB, Class BC, Class ABC). Due to these differences, it is important to always check the labels on the fire extinguishers before using them.
It’s also important to check the size of the fire extinguisher to know how long the extinguisher will last before being emptied. Typically, small-sized extinguishers (5 ABC) will only last 6 – 10 seconds, while larger-sized extinguishers (20 ABC) will last around 25 – 35 seconds before being emptied.
Identifying the Correct Fire Extinguisher to Use
Class A Rated
Class A Rated Fire Extinguishers are intended for use on ordinary combustibles: wood, paper, cardboard, dry vegetation, & some plastics. Class A fire extinguishers often contain water, so be sure NOT to use them on flammable liquid fires or electrical fires.
Class B Rated
Class B Rated Fire Extinguishers are intended for use on flammable liquids: fuels, paint thinners, solvents, oil, and grease. These CO2 extinguishers displace oxygen so the fire can not continue to burn, but these extinguishers can also displace the oxygen in a small enclosed place, so ONLY use them in well-ventilated areas. Also, the horn-shaped nozzle can become extremely cold, cold enough to cause frostbite, so be extremely careful when using a Class B Fire Extinguisher.
Class C Rated
Class C Rated Fire Extinguishers are intended for use on fires near or involving electrically energized equipment. This designation is typically seen on combination-type fire extinguishers that are suitable for other types of fires as well.
Class D Rated
Class D Rated Fire Extinguishers are intended to be used on fires involving combustible metals, such as magnesium, sodium, and potassium.
Class K Rated
Class K Rated Fire Extinguishers, the newest type on the market, are specialty extinguishers that are intended to be used on kitchen / deep fryer fires: animal oils, fats, and vegetable oils.
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