CO2 (Carbon Dioxide) .Co2s are primarily recommended for use on electrical equipment, often installed over the messier powder extinguisher’. This is due to the fact that the CO2 gas itself is not conductive. After use CO2’s tends to be considered a ‘cleaner’ fire extinguisher as they leave no real trace of being discharged, unlike other extinguishers that may leave water, foam or powder residue. CO2 Extinguishers are also effective at extinguishing Class B fires (Fires that involve flammable liquids).FridayFocus CO2 Fire Extinguishers