At the beginning of the 1980s, halon agent was considered to have destructive effect on the ozone layer, and it has threatened the environment. Therefore, measures were taken to phase out the halon fire extinguishing agent in many countries. Since the subscription of Montreal Protocol in 1987, the study on the halon alternatives (clean gas fire extinguishing agent) and the corresponding fire extinguishing systems has been lasted for more than 10 years. Among the halon alternatives, the clean ag...