Round duct machine is a type of machine used to manufacture round ducts for air handling systems. These ducts are commonly used in HVAC (heating, ventilation, and air conditioning) systems to distribute conditioned air throughout a building or structure. A round duct machine works by forming a piece of sheet metal into a cylindrical shape, using a series of rollers or dies to shape the metal. The machine may also have the ability to add seam closures or other features to the ducts as they are being formed. Round duct machines are highly efficient and can produce large quantities of ducts in a short amount of time, making them an important tool in the HVAC industry. They are also used in the manufacture of other cylindrical products, such as pipes and tubes.