Installation of plumbing, heating (non-electric) and air-conditioning systems

This sub-class includes the installation of plumbing, heating and/or air-conditioning systems, including additions, alterations, maintenance and/or repair. Units in this sub-class are primarily engaged in: - installation of heating systems (electric, gas and oil) - installation of non-electric solar energy collectors - installation of plumbing, sanitary and/or sewerage equipment - installation of ventilation, refrigeration and/or air-conditioning equipment and/or ducts - installation of gas fittings - installation of steam piping - installation of fire sprinkler systems - installation of lawn sprinkler systems - installation of duct work installation