Air cleaning units; Air humidifying apparatus; Air purification units; Air purifiers; Air sterilisers; Air sterilising apparatus; Air washers; Air exchangers for cleaning and purifying air; Filtering apparatus using activated carbon for filtering spirits; Filters and filtering devices for air and gas conditioning; Filters for air conditioning; Filters for air extractor hoods; Filters for drinking water; Filters for fluids, namely, for water and area-water solutions; Heaters for swimming pools...