eshraghi's work in the news network of shab bakhir khodanghadar.earlier, galvanized ducts were used for the air transfer of ventilation devices. this product is coated with aluminum and poly ester, with the aim of increasing the quality of the insulation used to transfer air from any air generator or air production device, to the relevant branches, these channels can be used. 100% of its material is prepared from the inside , and it has three main parts, pvc and aluminum and laminated, and now the boats that we use, is the law on two types of elastomer and polyester carpet , the new generation of air transmission channels, which is also considered as energy storage , has advantages over galvanized channels, very low weight that when installing the materials on construction, it can be removed, for example it can be used lower, where the acceptance of the blood is very high, where , for example, the channels are not able to pass through those places, such as those who are not patient , the false ceilings of the flexible channels are easily installed