The Sheet Metal Workers' International Association was a trade union of skilled metal workers who perform architectural sheet metal work, fabricate and install heating and air conditioning work, shipbuilding, appliance construction, heater and boiler construction, precision and specialty parts manufacture, and a variety of other jobs involving sheet metal. On August 11, 2014, it merged with the United Transportation Union (UTU) to form the International Association of Sheet Metal, Air, Rail and Transportation Workers, known by the acronym, SMART.