Apparatus and installations for lighting, heating, cooling, steam generating, cooking, refrigerating, drying, ventilating, water distribution as well as sanitary installations; fans; air-conditioning apparatus; space heating apparatus for industrial use; steam heating apparatus [for industrial use]; heating apparatus; industrial boilers; dehumidifiers; air filters for industrial use; air curtains; air sterilizers; air purifiers; aeration installations; air diffusers; air distribution units