This dimplex hepa air purifier with active carbon filter and viro3 technology has been specially designed to improve the quality of your indoor air reducing the presence of polluting agents such as dust cigarette smoke unpleasant odours spores bacteria pollen dust mite residues and even pet dander enviro neutralising technology attacks and neutralises the harmful impurities the negative ions produced by the viro technology are like those which can be found in large quantities in unco