Emily Griffith Technical College has partnered with a number of different unions and trade organizations to offer apprenticeship programs. In an apprenticeship program like sheet metal work, you’ll gain experience through on-the-job training and coursework provided by apprenticeship partners. Sheet Metal Worker apprenticeship programs typically last four years. What is a Sheet Metal Worker? Sheet Metal Workers use sheet metal for roofs, rain gutters, siding, ventilation, heating and air conditioning duct systems. They also assist in the development of restaurant equipment, customized precision equipment and many other products made from metal.