Mixed gas extinguishing agent is a mixture of nitrogen, argon and carbon dioxide gas in a certain proportion of gases, these gases are naturally present in the atmosphere, there is no depletion of the ozone layer in the atmosphere, nor will it affect the Earth's "greenhouse effect", and the mixture is non-toxic, colorless, odorless, non-corrosive, non-conductive, Neither supports combustion nor reacts with most substances, and is an ideal environmentally friendly type of fire extinguishing agent.