From heavy duty machinery factory to light industrial machinery factory, from cutting process to precise casting, from general process to special process, DurkeeSox® duct system apply to different kinds of workshops of machinery factories. The advantages of short engineering period, evenly air delivery on production line, simple and aesthetical with high cost performance etc captu-red the fancy of lots machinery factory entrerprises. DurkeeSox® duct system will replcae the traditional metal duct system very soon in future and become the prior choice of machinery manufacturing factories.