Halotron Fire Extinguishers OR CO2 Fire Extinguishers Which One is Best Halotron and CO2 extinguishers both have their advantages. Carbon dioxide is most effective when used in electronic equipment fires and is a trusted non-conductive clean agent, whereas Halotron is a perfect replacement for Halon 1211 extinguishers as it has a lesser environmental impact and leaves no residue is a clean, non-conductive gaseous agent. Halotron interferes with the chemical chain reaction and cools the fuel to extinguish the fire, whereas Carbon dioxide takes the place of oxygen and cools the fuel to extinguish the fire. Halotron and CO2 are rated for Class B and Class C fires, but Halotron extinguishers over 11 lbs are rated for fires of Class A.