Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air exchangers for cleaning and purifying air; Air filtering installations; Air filters for air conditioning units; Air filters for domestic use; Air purifiers for household purposes; Filters and filtering devices for air and gas conditioning; Filters for air extractor hoods; HEPA filters for household use; Machine that generates purified water from the atmosphere and simultaneously purifies the air; Personal air filtering units for filtering tobacco smoke exhaled directly into the unit; Swimming pool water cleaning and filtering units; Water filters