Air cleaning apparatus; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filtering installations; Air filters for air conditioning units; Air purifiers for automobiles; Air sterilisers; Air sterilising apparatus; Air sterilizers for commercial use; Air sterilizers for household use; Filters for air extractor hoods; Filters for air purifiers; Filters for use with apparatus for ventilating; Ionisation apparatus for the treatment of air; Ozonizers ...