Commercial sheet metal workers build and install large-scale HVAC systems in buildings such as hospitals, schools, office buildings, and manufacturing facilities.

These projects often involve complex duct systems and coordination with multiple trades on large construction sites.
Typical work includes:
Commercial sheet metal workers play a major role in constructing the infrastructure that keeps businesses and public spaces comfortable and safe.
Commercial HVAC
Commercial HVAC projects involve large duct systems, powerful equipment, and detailed coordination with other trades on construction sites. You’ll work in an active environment alongside electricians, plumbers, ironworkers, and other skilled professionals to build systems that keep buildings comfortable and healthy for the people inside.
These systems are essential infrastructure and are designed to last for decades, meaning your work will have a lasting impact on the community.
Architectural Sheet Metal
Architectural sheet metal combines technical skill with craftsmanship and artistry. In this area of the trade, workers create and install metal components that contribute to both the appearance and performance of buildings.
TAB Technician
Testing, Adjusting, and Balancing—commonly known as TAB—is a critical part of HVAC system performance. TAB technicians ensure that air and water delivery systems operate efficiently, quietly, and safely throughout a building. In this role, you’ll measure airflow and water flow, analyze system performance, and make adjustments so systems match the specifications outlined by the design engineer. This career path requires strong analytical thinking and attention to detail. If you enjoy math, problem-solving, and working with complex mechanical systems, TAB can be an especially rewarding specialization.
Welding
Welding plays an important role in commercial and industrial sheet metal work. In this specialty, workers help fabricate and assemble large-scale metal systems and custom-built components. These projects often last for years and contribute to industries such as automotive manufacturing, food processing, and large-scale construction. Welding specialists help build the equipment and infrastructure that keep these industries moving.
No matter which path you choose, every sheet metal worker shares the same mission: designing, building, and maintaining the systems that keep indoor air clean and comfortable.
Through the Local 1 Apprenticeship Program, you’ll gain the training, experience, and support needed to build a successful career in any of these specialized areas.
Established in Peru, Illinois almost 50 years ago, Chapman's Mechanical Systems is a multi-generational family operation that evolved from a sheet metal specialist into a comprehensive mechanical contractor.
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The Second Annual Car Show was back on Saturday, September 13! Friends and family of Local Unon 1 gathered to admire classic and custom cars and enjoyed music and food trucks.
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In October, we came together for our annual Awards Banquet to honor retirees, long-serving members and apprentices. Your hard work and commitment have built a stronger union and a stronger community.
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