Round Duct Making Machine manufacturers Roval Roller Description Roval roller forms Round, oval, triangle and reducers as well as many other common forms in the sheet metal industry. With its programmable controller, it aims to replicate. High-precision shapes that are essential for mating parts. About after-sales service, we have professional technicians who can teach you how to operate machines by video and we can also provide engineer overseas service or you can send your workers to our factory in China to learn operation method. SBKJ GROUP is located in No.78 Huanxi Road, Jiangyin City, Jiangsu P.R., it鈥檚 near by Shanghai. Our factory has both CNC duct production line which can make air duct automatically and separate machines which are easier to move. Products mainly consist of the auto duct production line, rectangular duct making machine and round/spiral duct forming machine. Besides, OEM service is available. Customers can choose any message media email, mob, WhatsApp, Skype, facebook, youtube and WeChat to contact us if you have any question that needs us to solve about HVAC duct manufacturing machines. We will reply you and help you to solve all problems as soon as possible. With regard to after-sales service, we will send you a video about that our technicians tell you how to use operate machines. Meanwhile, engineer overseas service is available. Technical Data Min. Diameter130mm Max. Width1250mm Thickness0.4-1.2mm Power3kw Weight580kg Dimension2350*770*1485mmRound Duct Making Machine manufacturers website:http://www.spiraltubeformer.com/round-duct-making-machine/