In a typical fire, there is intensive inter-reaction between atoms and fragments of unstable free radicals in the presence of oxygen. This continues until the burning fuel is depleted. FP extinguishes fire predominantly by inhibiting on a molecular level the chemical chain reactions present in combustion. On activation of the FP unit, the FPC compound is transformed into a rapidly expanding fire-extinguishing condensed aerosol consisting mainly of Potassium salt-based K2CO3, H2O (vapour), N2 and CO2. The gas-type, 3-D properties of the condensed aerosol facilitate its even and fast distribution in the protected volume and its flow into the natural convection currents of combustion. The solid particles of Potassium salts, which are a few microns in size, are suspended in an inert gas with a high surface-to-reaction mass ratio. A fact that increases efficiency? Which results in fewer quantities of fire extinguishing agents required. When the condensed aerosol reaches and reacts with the flame, Potassium radicals (K* ) are formed mainly from the disassociation of K2CO3. The K* s bind to other flame-free radicals (hydroxyls ? OH-), creating stable products such as KOH. This action extinguishes fire without depleting the ambient oxygen content. KOH reacts further in the presence of CO2 and forms K2CO3. The solid particles of Potassium Carbonate (K2CO3) have a diameter of fewer than five microns. They remain in suspension in the secure room/enclosure for at least 30 minutes, preventing further re-ignition of the fire.