Air cleaning apparatus; Air filtering installations; Air purifiers for automobiles; Household air cleaners; Swimming pool water cleaning and filtering units; Swimming pool chlorinating apparatus; Air sterilizers for household purposes; Filters and filtering devices for air and gas conditioning; Gas purification machines; Germicidal lamps for purifying air; Air purifiers for household purposes; Ionisation apparatus for the treatment of air; Ozone sanitizers for air and water; Vehicle-mounted a...