Air cleaning units; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air exchangers for cleaning and purifying air; Air filtering installations; Air purification units; Air purifiers; Air purifying apparatus; Air purifying apparatus and machines; Air purifying units for green house, hospital, agricultural and industrial use; Air sterilisers; Air sterilizers; Air sterilizers for green house, hospital, agricultural and industrial use; Ionisation appar...