Plasma cutting is a process that cuts through electrically conductive materials by means of an accelerated jet of hot plasma. Typical materials cut by this process include steel,aluminum, brass and copper though other conductive metals may be cut as well. Plasma cutting is often used in fabrication and welding shops, automotive repair and restoration, industrial construction, salvage and scrapping operations. Due to the high speed, precision cuts, combined with low cost of operation, plasma cutting sees a widespread usage from large scale industrial Computer Numeral Control applications down to small hobbyist shops. We use plasma cutting to get precision cuts of metal for fabricating the ducts we make. See photos and a video of our plasma cutter in action cutting sheet metal into the shapes needed for creating a duct.