| Class 4322: Plumbing, heat and air-conditioning installation |
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| This class includes the installation of plumbing, heating and air-conditioning systems, including additions, alterations, maintenance and repair.
This class includes: - installation in buildings or other construction projects of: • heating systems (electric, gas and oil) • furnaces, cooling towers • non-electric solar energy collectors • plumbing and sanitary equipment • ventilation and air-conditioning equipment and ducts • gas fittings • steam piping • fire sprinkler systems • lawn sprinkler systems - duct work installation |