What is 18 b c fire extinguisher

The Class A size rating represents the water equivalency. Each number represents 1 ¼ gallons of water. For instance, 2A means the extinguisher is just as effective as 2 ½ gallons of water. 4A is equivalent to 5 gallons of water. The Class B size rating indicates the square footage the extinguisher can cover. 20B means that as long as you …

The A, B, C rating system defines the kinds of burning materials each fire extinguisher is designed to fight. The number in front of the A, B, or C indicates the rating size of fire the unit can extinguish. To achieve a Class “A” rating, the extinguisher must be capable of putting out the wood crib, wood panel and excelsior (shredded paper …

Guide to Fire Extinguisher Sizes, Types, & Ratings

A: The number in front of the "A" measures water equivalency. One A is equivalent to 1.25 gallons of water, so a unit with a 4A rating has an equivalent of 5 gallons of water to battle Class A fires. B: The number in front of the "B" is a relative measure of the area an extinguisher can cover. C & K: These letters indicate that an extinguisher …

Also Check: What is inside a class a fire extinguisher

Class A Rating: Class A fire extinguishers are meant to be used against fires involving paper, wood, plastic, cloth and other ordinary combustible materials. Identified with the letter A inside a green triangle. Class B Rating: Extinguishers with a Class B rating are meant for putting out fires cause by flammable liquids such as gasoline, oil …

What chemicals are used in a Class B fire extinguisher?

The primary chemical used to fight these fires is monoammonium phosphate, because of its ability to smother fires in these types of materials. Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited.

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What is a Class C fire extinguisher?

Fire extinguishers with a Class C rating are suitable for fires in “live” electrical equipment. Both monoammonium phosphate and sodium bicarbonate are commonly used to fight this type of fire because of their nonconductive properties. Fire extinguishers are classified by fire type.

What do fire extinguisher classes and size ratings mean?

To ensure you buy the right type and size for the application you have in mind, learn more about fire extinguisher classes and size ratings. The letter on a fire extinguisher indicates its classification: Class A puts out ordinary combustible fires (wood, paper, plastic, etc.) Class B puts out flammable liquid fires (oil, gas, petroleum, etc.)

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What comes out of a fire extinguisher?

The extinguishing agent comes out of the extinguisher to eliminate fires. It is fed out of the extinguisher’s tank via a pickup tube once an expellant (often from a compressed gas canister) is released into the tank. The expellant is released when the safety pin is removed and the discharge lever is squeezed.