[ Heat and steam accumulators; air conditioning and air cooling apparatus; ] air dryers, namely, [ refrigerative ] and absorption dryers used for the removal of liquid and vapour contaminants from compressed air and gases; [ air purifying apparatus and machines; boiler pipes in the nature of tubes for heating installations; boilers for heating installations, other than parts of machines; ] coils as parts of distilling, heating or cooling installations; gas condensers, other than parts of machines; [ components for air conditioning and cooling systems, namely, evaporative air coolers; ] cooling installations for liquids; [ drying apparatus and installations for use in heating, ventilation systems, air conditioning systems and refrigeration systems; fuel economisers, namely, heat exchangers used to transfer heat and increase system efficiency; ] fans for air conditioning apparatus; fans as parts of air conditioning installations; flare stacks for use in the oil industry; flares; gas condensers, other than parts of machines; gas scrubbers as parts of gas installations; gas scrubbing apparatus; [ heat accumulators; ] heat exchangers, shell and tube heat exchangers, not being parts of machines, fin-fan air cooled heat exchangers and stainless steel and titanium plate heat exchangers, not being parts of machines; [ heat generators; immersion heaters; heating apparatus for heating gases and liquids; heating boilers; water and hot water heating installations; hot plates; ] oil scrubbing apparatus; [ refrigerating apparatus and installations; steam accumulators; steam boilers, other than parts of machines; steam generating installations; water heaters; ] scrubbing and stripping towers for removal of water soluble gases; gas purification systems; bio and land fill gas purification apparatus; pressure vessels, namely, gas separators, gas dryer columns, liquid receivers, coalescing filter vessels, gas-liquid separators; gas scrubbing vessels; gas stripping vessels, and gas flashing vessels; cooling appliances for removing heat from liquids and gases; cooling machines for removing heat from liquids and gases