There is a lot that goes on behind the scenes in any given operation. Most people do not give a second thought to the inner workings of a machine or system that they are using, as most are designed to be hidden from sight, whether for design or functionality purposes. This is true of most heating, ventilation, and air conditioning, or HVAC, systems as well, though they are a major component of just about any building you set foot in, for the comfort and air quality of the structure. But from the sheet metal fabrication to oval duct fittings of…