An air duct beading machine is a specialized HVAC fabrication tool designed to create reinforced ribs (beads) on sheet metal ductwork. These beads enhance structural rigidity, prevent duct deformation under air pressure, and improve acoustic insulation by reducing vibration. The machine processes galvanized steel, aluminum, or stainless steel sheets (0.3–1.2 mm thick) via precision rollers, forming uniform, parallel beads at adjustable intervals — common patterns include single, double, or offset beads.