Preparation Most sheet metal workers learn their skills through an apprenticeship sponsored by the union. Apprenticeships last four or five years and include at least 144 hours of classroom training each year. Apprentices learn both assembly and installation of sheet metal products. On the job, they learn the basics of pattern layout. They also learn how to cut, bend, assemble, and install sheet metal.
Apprentices begin with basic ductwork.
Eventually they learn to make more complex ducts, fittings, and decorative pieces. They also learn how to work with fiberglass, plastics, and other nonmetallic materials. In the classroom, apprentices study drafting, plan and specification reading, and the principles of heating, air-conditioning, and ventilating systems. They also study trigonometry and geometry for layout work, the use of computerized equipment, and welding. In addition, apprentices learn the relationship between sheet metal work and other construction work.