Filter set, for AP25 air purifier, HxWxD 255 x 275 x 60 mm. Supplied = assembled. Height = 255 mm. Width = 275 mm. Depth = 60 mm. Material = plastic. Product type = accessories for air purifiers. Reliable filtering provided by multilayer filters. Set of spare filters comprised of two identical filters. Multilayer filter with prefilter layer, HEPA fine dust filter layer, active charcoal layer. Separation efficiency of 99.97% for 0.3 m particulates. The multilayer filter reliably removes pollutants and contaminants such as dust, fine dust (PM10, PM2.5 and smaller) , pollen and other airborne allergens from the indoor air, as well as pathogens such as bacteria, viruses and mould spores, cigarette smoke, exhaust gases, chemical vapours (formaldehyde, toluene, VOC etc.) and odours.