Air-conditioning apparatus and installations; Air-conditioning apparatus; Aquarium heaters; Barometric condensers for condensing vapors by contact with liquids; Components for air conditioning and cooling systems, namely, evaporative air coolers; Cooling evaporators; Heat exchangers not being parts of machines; Heat exchangers, other than parts of machines; Heat pumps; Heat sinks for use in heating, cooling and ventilating apparatus; Heating systems composed primarily of tubes, pipes and pre-...