It is a technology to maintain oxygen concentration within the protected area on required level so as to prevent burning process. Oxygen quantity within the protected area is controlled by the addition of nitrogen. Nitrogen is a natural part of the air and for the above purpose it is produced in a simple way through air dissociation. The mixture of oxygen and nitrogen in required concentration is non-toxic and harmless for humans. The use of the OxyReduct® system may be considered at all places where no fire whatsoever should break out or in objects where irretrievable values are stored (strong-rooms, safes, libraries, museums, archives, depositories).