Carbon Dioxide is ideal for fires involving electrical apparatus, and will also extinguish class B liquid fires. But has NO POST FIRE SECURITY and the fire could re-ignite. >CO2 fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle. It also be removing the heat with a very cold discharge.Carbon dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires. These kind of fire extinguishers suit class c (fires caused by electrical device), and also class B (liquid) fires, but don’t have any effect on class A fires.</div>