Apa240 air purifier this air purifier provides cleaner air in rooms up to 24m2 especially beneficial in the home for allergy sufferers and asthmatics it also reduces or eliminates tobacco smoke a 5 stage filtering system cleanses the air of many undesirable contaminants stage 1 a pre filter removes large particles such as those from human and pet hair stage 2 a multifunction antibacterial filter removes pollen bacterial and fungal spores stage 3 a hi