All NINZ series products are constructed using technologies completely new to the firedoor sector. To guarantee maximum rigidity, the metal sheets of the door leaves are glued to the insulating-material core. All accessories and their functions are specially selected and studied so that all relevant norms, in particular those regarding the selflocking mechanism of the secondary door leaves, are adhered to. All door components are fully galvanized, and a perfect, aesthetic finish results from the use of thermo-hardened powder coating.