An aerosol generator is a self contained extinguishing unit that contains an aerosol forming compound which, during a controlled combustion process within the generator, produces an ultra-fine aerosol extinguishing agent that is significantly more effective than currently available alternatives. The units are constructed of stainless steel components, are listed for both area and volumetric coverage, and require no piping, nozzles, or other distribution equipment. In effect, the generator acts as its own storage, production and delivery device.