Daehan Spiral Duct owns production lines of Spiral Velix and Spiro which are professional duct providers in Swiss and the USA, respectively. Also, it is technologically affiliated with foreign companies and its excellence is recognized within Korea alongside completely automated machines and self-manufactured machines made from Korean technologies as well as cooperation with affiliated companies. Our products are excellent inside as they are formed in round shapes from drums based on accurate sizing and lockseam adhesion via influx, which are made of high-quality fabric. Currently, the efficiency of our round ducts in air conditioning as well as air supply and ventilation duct facilities has been proven by constructors and professional duct constructors and its use is increasing. The company restlessly researches and develops for customer satisfaction through thorough quality control and follow-up management.