Apparatus for heating, steam generating, ventilating, water supply and sanitary purposes, namely wood-heated sauna stoves, electric sauna heaters, water heaters, steam generators, steam baths, sauna bath installations, bath installations, showers, shower cubicles, shower screens, shower trays, bath tubs; ventilating louvers, vents and ventilation dampers as parts of air conditioners, ventilators for saunas