11 Lighting, heating, steam generation, cooling, drying, ventilating and water supply apparatus, namely, refrigerators, heat exchangers, bare coils, condensers, fluid coolers, coolers; heating apparatus, namely, feed water heaters and electric heaters for commercial use; steam generators; heat exchangers not being parts of machines; heat exchangers not being parts of machines, namely, lamellar heat exchangers, plate heat exchangers, tubular heat exchangers; cooling installations, namely, evaporative air coolers, glycol recoolers and shock frosters; freezers, recooling apparatus for cooling media; refrigerator parts, namely, pipes and finned tubes; apparatus for heating and refrigerating equipment for waste heat recovery included in this class, namely, air conditioners; refrigerating appliances and installations; evaporative air coolers for furnaces; refrigerating cabinets, refrigerators; ice machines and apparatus; air-conditioning installations; air-conditioning apparatus; evaporators, in particular industrial high-performance evaporators; tubular evaporators; tubular cooling evaporators; heat pump evaporators; heating installations; exchange tubes being parts of heating installations; steam generating installations; steam boilers not parts of machines; steam accumulators; electrochemical gas generators; gas heating boilers; gas refrigerator condensers and condenser pipes therefor; electric air heaters for commercial use; ventilation installations, namely, ventilation hoods for stoves; level controlling valves in tanks, namely, for use in controlling the level of fluids in tanks; heat regenerators; heat accumulators; cooling installations for water, namely, water coolers and water cooling towers; heat pumps and ventilators for air conditioning systems; ventilator frames being parts of air conditioning installations; humidifying apparatus and systems, namely, humidified mats, humidified pads; electric humidifiers; humidifiers for central heating radiators