Air filtering installations; Air filtering units; Air filters for air conditioning units; Air filters for heating and cooling registers; Air purifiers; Air purifiers for household purposes; Air purifying apparatus and machines; Filtering apparatus using activated carbon for filtering spirits; Filters and filtering devices for air and gas conditioning; Filters for air conditioning; Household air cleaners; Humidifiers; Personal air filtering units for filtering tobacco smoke exhaled directly into the unit; Water filtering units for domestic use; Water filtration and purification units and replacement cartridges and filters therefor