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Square HVAC Duct Flange Forming Making Machine/ T-15 Tdf Flange Rollformer. Efficient and low-cost: The common plate flange process eliminates complex procedures, greatly saving labor and material costs. Superior quality and sealing: Mechanized production makes the flange shape beautiful and flat, without welding. Green and environmentally friendly: No need to use anti-corrosion paint, eliminating paint pollution and welding fumes, and improving the working environment.