The sheet metal industry consists of the production, installation and maintenance of commercial and residential HVAC (Heating, Ventilation and Air Conditioning) and other materials that affect indoor air quality such as Testing and Air Balancing (TABB), detailing, CAD work, service and refrigeration. Sheet metal is more than HVAC, it also includes welding,  architectural sheet metal, siding and decking, food processing systems, and other specialty metal products.  Sheet Metal Workers have carried on the centuries-old craft of  shaping metal into useful and beautiful forms.

While HVAC systems produced and installed by sheet metal workers are mostly hidden in ceilings and walls, their architectural work is easy to find in some of the most notable buildings in North America such as the Statue of Liberty, the CN Tower, Chrysler Center, Empire State Building, Experience Museum in Seattle, the Pentagon, and the Jay Pritzker Pavilion in Chicago.