Installation, maintenance and repair of electric, gas or oil heating systems

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