11 Air treatment apparatus and systems, namely, air purifying apparatus for the protection of the internal environment against viruses, bacteria and superbugs; air and surface decontamination apparatus, namely, air purification treatment and decontamination machines emitting hydroxyl radicals; apparatus for the decontamination of medical materials and medical areas, namely, air purification treatment and decontamination machines emitting hydroxyl radicals; apparatus for the decontamination of surgical materials and surgical areas, namely, machines emitting hydroxyl radicals; air cleaning filters, parts of air cleaning machines or installations; air conditioning filters; air filtering installations; air filters for use as dust arrestants or extractors, namely, ventilating exhaust fans; apparatus for decontaminating breathing air, namely, air purifying apparatus; decontamination chambers, namely, dryers used for the removal of solid, liquid and vapour contaminants from compressed air and gases; decontamination showers; disinfectant apparatus for industrial purposes; air sterilizers; apparatus for controlling smoke, namely, ventilating exhaust fans; dust cyclone filters, namely, air filters for domestic use; fluorescent lamps with low ultra-violet light output; electrochemical gas generators, installations; germicidal lamps for purifying air, namely, disinfecting ultraviolet lamps housed in a container or cover for disinfecting objects placed therein; air filtering installations for dust separating; ionisation apparatus for the treatment of air; portable decontamination apparatus, namely, air purifying apparatus; regulating and safety accessories for gas apparatus, namely, electro-chemical flue gas scrubbing machines; pollen filtering apparatus, namely, air filters for domestic use; sanitary apparatus and installations, namely, air filters for domestic use; sterilizers; ultra-violet irradiators not for motors and engines; ultraviolet lamps not for medical purposes; ultraviolet ray lamps not for medical purposes; ventilation, air-conditioning, installations and apparatus, namely, ventilating exhaust fans; ventilation, air-conditioning, installations for vehicles, namely, ventilating exhaust fans