The code B-1 on a fire extinguisher indicates that it should be used to put out fires due to flammable liquids like gasoline, oil, grease, etc. The number identifies the approximate range (in square feet) of flammable liquid fire that can be extinguished by an ordinary user.
Further Explanation:
Other classification of fire extinguisher include:
Class A extinguishers are used for ordinary things or flammable solids that burn such as paper, textile, coal, and wood.
Class C extinguishers are to put out fires due to the combustion of gases such as natural gas, methane, and propane.
Class D fire extinguishers are for flammable metals. Flammable metals are usually Group 1 and 2 metals like sodium, lithium, potassium, and magnesium.
Class F fire extinguishers are used in restaurants. They are used for fires that involve cooking materials like oil, grease, and fat.
Fire extinguishers work by removing one or more components of combustion. The "fire triangle" states that for any combustion reaction to occur, all three components must be present:
Some fire extinguishers work by displacing oxygen gas using carbon dioxide, removing contact between the combustible material and oxygen, or cooling the surface to avoid re-ignition or spreading of flames.
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Keywords: fire extinguisher, Class B-1
