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UL Rating Guide
All Fire Extinguishers are tested by the Underwriters Laboratory for safety and performance. They are rated based on the type of fire that they will put out, and their classification is determined by the size of fire they will put out.
Do you already know the UL Rating for the fire extinguisher(s) you need?
Shop Fire Extinguishers by UL Rating:
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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