Five classes of Fire
For each class of fire, there is a fire extinguisher type suitable for the specific fuel, heat source, and chain reaction.
Class A rated extinguishers are effective on fires involving paper, wood, textiles, plastics, and other ordinary combustibles.
Class B rated fire extinguishers are appropriate against flammable liquids,
such as gasoline, oil, kerosene, or paint.
Class C rated extinguishers are suitable for fires in “live” electrical equipment like breaker panels, transformers, generators, appliances, etc.
Class D rated fire extinguishers are used on burning metal fires and contain specialized extinguishing agents, like sodium chloride, which is effective on most alkali metals, including sodium, potassium, magnesium, titanium, aluminum, and zirconium. Copper-based Class D agents are useful in combatting lithium fires.
Class K extinguishers are used exclusively for fires involving cooking oils and burning fat that are typically found in commercial cooking establishments.
TYPES OF FIRE EXTINGUISHERS
Below you will find a helpful chart to assist in identifying which type of extinguisher is most appropriate for your facility or application. Keystone carries all of the extinguishers you see here and more. We offer inspection, testing, service, and recharging of all classes and sizes. Our Life Safety Advisors are ready to assist with any questions on how to protect your business from fire.