Carbon dioxide fire extinguishers should be used to extinguish the fire of live equipment. The carbon dioxide fire extinguisher is suitable for extinguishing the initial fires of various combustible liquids and gases, as well as the fires of live equipment, precision electronic instruments and valuable equipment. But it is not suitable for outdoor use when it is windy. After being used in a narrow and closed space, it should be ventilated or evacuated from the site in time to prevent suffocation.
At normal pressure, liquid carbon dioxide will vaporize immediately. Generally 1kg liquid carbon dioxide can produce about 0.5 cubic meters of gas. Therefore, when putting out a fire, carbon dioxide gas can exclude air and surround the surface of the combustion product or distribute in a relatively closed space, thus reducing the oxygen concentration around the combustible or in the protective space, causing suffocation and extinguishing the fire.