The DURA DUPI 08-N Fire Duct has been designed to protect HDPE shredders and related fiber optic cables or any copper cables housed inside it from the risk of fire. It is recommended to use it in all “risky” situations such as trench / viaduct transitions and in the presence of vegetation or flammable materials at distances of less than 4 meters. In fact, it has been seen that the fire of the scrub normally present along the embankments of viaducts, bridges and along other structures in general, irreparably damages both the traditional GRP channel and the cables inside it, causing serious inconvenience to users and high costs for restoring the destroyed lines. This new product solves the problems mentioned thanks to the materials used, the particular construction care and its compatibility with the traditional channel. The fire duct designed by Duratel is made of 10/10 galvanized iron sheet, protected on the outside with an intumescent paint which, hit by fire, increases its thickness forming a carbonaceous foam with high insulating power. A ceramic fiber mat is placed inside the channel, resistant up to 1260ºC, which integrates the function performed by the external paint. The tests performed both in the laboratory and in the field, taking as a reference the DIN 4077 standard, highlight the performance of this product and demonstrate how the “standard” fire described by the aforementioned standard does not damage the contents of the duct in any way. Other important features of the channel made with this system are re-accessibility, restorability and connectability with the GRP channel. Re-accessibility means that to access the cables and optical fibers inside the channel, simply unscrew the junction bolts and lift the cover, as in the traditional fiberglass channel. After each fire it is sufficient to restore the outer layer of intumescent paint by scraping off the charred part and repainting with the new intumescent paint. Connectability is ensured by the dimensions of the channels, which are perfectly compatible with those of the GRP channel.