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Flip-Flap doors for use in air conditioned environments with positive temperatures, for applications in all branches of the food industry, supermarkets, hypermarkets, catering, hospitality. One or two leaf hinged door mainly used in corridors, offices, and to separate work or service areas. For use in areas with positive temperatures. Single or double leafed door for use mainly in corridors or offices, and to separate work and service areas, especially “clean” and “dirty” areas using an “airlock” system.