Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. The carbon dioxide is also very cold as it comes out of …
The carbon dioxide considered the best fire extinguisher to put off fires caused by burning of inflammable liquids such as petrol or oil because carbon dioxide stops the influence of oxygen because it decreases the oxygen present in that fire which leads to the fallout of fire.
CO2 Fire Extinguishers – Fire Risk Assessment Network
The principle that this fire extinguisher type works on is replacing the oxygen that surrounds a fire with carbon dioxide; hence, the fire cannot continue to burn. This is in contrast to using water or a foam extinguisher to cool a fire. This is why a CO2 fire extinguisher is not the right choice for a fire that involves flammable solids.
CO2 fire extinguishers are safe to use on active electrical circuits and are suited for Class B liquid fires. Flammable liquids and gases, solvents, oil, greases (excluding culinary oils/greases), tars, oil-based paints, and lacquers are all Class B fires that can be put out with a …
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher