Gas fire extinguishing is a term used to describe the use of inert gases and chemicals to extinguish fire. Also called clean agent fire extinguishing. These chemicals are managed by the National Fire Protection Association (NFPA) standard for use in clean fire extinguishing systems. In the United States in 2001, there were different standards and regulations in other parts of the world. The system usually includes proxy, proxy storage container, proxy release valve, fire detector, fire detection system (wiring control panel, drive signal), agent delivery pipeline and proxy dispersion nozzle. Typically, the agent can be produced by gas produced by solid propellants, which produce inert or chemically active gases.