Peculiar calcium silicate insulation (DIN 4102) CLASS 0 REI120 that releases water molecules to lower the internal temperature in the event of a fire; high-temperature panels (800°C) made of mineral wool (without ceramic fiber) with MO CSTB certification n°9234624.3 and RINA certification of non-combustibility, fixed with ceramic adhesives. Thermal self-expansion joints in the sealed areas. The elements used allow excellent insulation and achieve a low cabinet weight. Internal dimensions 978 x 349 x 493