Mestek Machinery is the industry-leading designer and manufacturer of the most complete, productive, and innovative metal for ... ming solutions for the fabrication of HVAC sheet metal ductwork and fittings. Our family of brands — Lockformer, Iowa Precision, ISM Machinery, Engel, and Roto-Die — have decades of experience addressing every facet of the HVAC duct industry. The result is a combined knowledge and experience that develops cutting edge, precision technologies and automated manufacturing equipment that saves sheet metal contractors and fabricators time and labor while ensuring a finished duct product of the highest quality. read more