11 Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply and sanitary purposes; heating, ventilating, and air conditioning and purification equipment; burners, boilers and heaters; heat exchangers; heat exchangers for use in contact with corrosive gases; air reheaters; drying installations; heat regenerators; heat generating apparatus; heat regenerating installations; apparatus and installations for malt houses and drying food; heat exchangers, other than parts of machines; indirect heat exchangers; gas heat exchangers; water-gas heat exchangers; water-gas heat exchangers that cool flue gas; steam-gas heat exchangers; steam reheaters; glass tube heat exchangers for energy and heat recovery; glass tube heat exchangers; heat exchangers for cooling or condensing media using air; condensing heat exchanger; heat exchangers.