11 Air treatment apparatus and systems, namely, ionisation apparatus for the treatment of air; air purification units, namely, air treatment apparatus for the protection of the internal environment against viruses, bacteria and superbugs; filters for removing viruses, namely, filters within air purification systems; air and surface decontamination apparatus and installations, namely, air purifiers, dryers used for the removal of solid, liquid and vapour contaminants from air; apparatus for the decontamination of medical materials and medical areas, namely, air purification treatment and decontamination machines for eliminating indoor allergens, malodours, indoor pollutants, formaldehyde, carbon, and pathogens; air cleaning filters for air cleaning machines or installations; air conditioning filters; air filtering installations; air filters for use as dust arrestants or extractors, namely, air filters for industrial installations; apparatus for exhausting dust, namely, air filtering installations for exhausting dust; apparatus for extracting dust, namely, air filtering installations for extracting dust; apparatus for filtering dust, namely, air filtering installations; apparatus for decontaminating breathing air, namely, air purifiers and air filtering installations; decontamination chambers, namely, air purifiers and air filtering installations; decontamination showers; disinfectant apparatus, namely, apparatus for cleaning the air; air sterilisers; apparatus for collecting dust from the air, namely, air filtering installations; apparatus for controlling smoke, namely, air purifiers; dust cyclone filters, namely, filter cartridges for dust collection systems; dust filters, namely, filter cartridges for dust collection systems; dust removing installations in the nature of air purifying installations; dust suction installations in the nature of air purifying installations; ventilators for dust removing installations; fluorescent lamps with low ultraviolet light output; germicidal lamps for purifying air; installations for dust separating in the nature of air purifying installations; ionisation apparatus for the treatment of air; portable decontamination apparatus, namely, portable air purifiers; regulating and safety accessories for gas apparatus, namely, direct vents for gas applications, filtering devices for gas conditioning; pollen filtering apparatus in the nature of air purifying installations; sanitary apparatus and installations in the nature of air purifying installations; sterilizers; ultraviolet lamps for use in air treatment apparatus and systems; ultraviolet ray lamps for use in air treatment apparatus and systems; ventilation and air-conditioning installations and apparatus except for vehicles, namely, air conditioning units; apparatus for producing ozone, namely, ozone generators that kill mould and mildew; apparatus for protection against contamination, namely, air purification systems comprised primarily of dehumidifiers and air purifiers; ionisation apparatus for the treatment of air