[ Steam generators and structural parts thereof; ] electric generators; furnaces; water heaters and boilers for industrial use and structural parts thereof; gas condensers other than parts of machines, steam condensers and structural parts thereof; [ oil and gas burners for industrial use; heat-recovery equipment, comprised primarily of heat recovery steam generators; nitrogen oxide reduction systems, comprised of gas scrubbers; selective non-catalytic and catalytic nitrogen oxide reduction systems, comprised primarily of catalyst chambers, storage tanks, vaporizers, pumps, fans, ammonia injection grids, soot blowers and sonic horns that use chemicals, air pressure, noise vibrations, and mechanical means to reduce certain chemical compounds to different, less harmful compounds, including reducing nitrogen-oxide (NOx) to nitrogen and water, and low nitrogen oxide combustion systems, comprised primarily of low-Nox burners and related components, including those that use over-fired air; emissions control systems, comprised primarily of special low Nox burners or pressurized fluidized bed combusters and Nox reduction systems, comprised primarily of selective non-catalytic and catalytic Nox reduction systems, which in turn are comprised primarily of catalyst chambers, storage tanks, vaporizers, pumps, fans, ammonia injection grids, soot blowers and sonic horns that use chemicals, air pressure, noise vibrations, and mechanical means to reduce certain chemical compounds to different, less harmful compounds, including reducing Nox to nitrogen and water; ] desalination installations, desalinators and structural parts thereof; refuse disposal installations, namely, waste disposal incinerators; [ air purification installations; ] heating and cooling apparatus, comprised primarily of direct fire furnaces, including fired heaters and waste heat recovery generators, furnaces used in delayed coking and hydrogen production technologies, feed water heaters, condensers, surface condensers; chemical and petroleum processing plants and equipment, comprised primarily of fired heaters and waste heat recovery units [ ; water purification machines for use in the oil and gas, oil refining, chemical and petrochemical, pharmaceutical, environmental, metals and mining, power generation, and power plant operation and maintenance industries; combustion control systems comprised of structural parts for industrial boilers ]