Plumbing, heat and air-conditioning installation

This class includes the installation, repair and maintenance of plumbing, heating and air-conditioning systems, including additions and alterations. This class includes: - installation, maintenance and repair of: • heating systems , e.g. heat pumps and solar thermal collectors • furnaces, cooling towers • plumbing and sanitary equipment • ventilation and air-conditioning equipment and ducts • gas fittings • steam piping • sprinkler systems, e.g. fire and lawn sprinkler systems - construction or installation of masonry heater stoves - duct work installation This class also includes: - medical gas distribution systems in hospitals

This class excludes: - installation of electric baseboard heating, see 4321 - camera inspections in air ducts, water and gas pipes, and other liquids without repair or installation, see 7120