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UL Rating Guide
Classes of Fires:
Class A: Wood, Paper, cloth, trash, plastics (solids that are not metals).
The numerical rating for a Class A Fire extinguisher refers to the amount of chemicals/agent in the extinguisher. The number represents the chemical/agent's equivalent to gallons of water the extinguisher holds. Multiply the number in front of A by 1.25 to figure out the equivalent to gallons of water.
• Example: A Fire Extinguisher with a rating of 2A would contain the equivalent to 2.5 gallons of water (2 x 1.25)
Class B: Flammable Liquids-Gasoline, oil, grease, acetone (includes flammable gases).
The numerical rating for a class B fire extinguisher refers to the number of cubic feet that the Fire Extinguisher will be able to extinguish.
• Example: A Fire Extinguisher with a rating of 1A:10B:C would contain agents equal to 1.25 gallons of water (1 x 1.25) and would be able to extinguish 10 square feet of a class B fire.
(The extinguisher would also be rated non-conductive due to the C rating)
Class C: Electrical Fires, Energized electrical equipment fires (anything that is plugged in).
Class C do not have a numerical classification. When "C" is present in the classification/UL rating, it indicates that the agents in the fire extinguisher are non-conductive, meaning that you can use them on an electrical fire (meaning anything that is plugged in).
• Example: A Fire Extinguisher with a rating of 5B:C would be able to extinguish 5 square feet of a class B fire and could also be used on a Class C fire (electrical- anything plugged in) due to it's non-conductive properties.
Class D: Metal fires involving magnesium, sodium, potassium and sodium-potassium alloys.
Class D Fire extinguishers are generally not given a numerical rating. They are simply classified as a "Class D" extinguisher.
Class K: Commercial Deep Fat Fryers (cooking oil fires).
Class K Fire extinguishers are have been rated to be used on Kitchen fires involving cooking oils and deep fryers. Class K are not given a numerical rating.
• Example: A Fire Extinguisher with a rating of 2A:K would contain the equivalent to 2.5 gallons of water (2 x 1.25) and would also be approved to be used on a Class K (cooking oil) Fire.
Use Our Helpful Fire Extinguisher Guide:
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