Maximize duct quality and workshop productivity with industry-leading square and rectangular HVAC duct fabrication machinery from Mestek Machinery and our legendary brands — Lockformer, Iowa Precision, Engel, and Roto-Die. From high-speed automated HVAC duct coil lines, to our extensive line of rollformers that covers the full range of industry-standard HVAC duct flange connector profiles, to our Cornermatic automated corner insertion systems, and Whisper-Loc seam closers, our machinery spans every phase of straight duct and complex fitting production and is engineered to comply with rigorous SMACNA duct construction standards. Whether equipping a high-volume prefabrication facility or looking to upgrade specific shop operations, our square and rectangular duct manufacturing solutions deliver the automation, accuracy, and durability needed to dramatically lower shop floor labor costs and drive long-term profitability.