Zosefera za Mann + Hummel zamkati zamagalimoto zakhala gawo la maphunziro apadera a University of Heidelberg omwe awonetsa kuti combifilter imachepetsa kuchuluka kwa nitrogen dioxide mkati mwagalimoto ndi kupitilira 90%.

Pofuna kuteteza anthu okhala m'kabati ku mpweya woipa ndi fungo losasangalatsa, combifilter ili ndi pafupifupi 140 g ya carbon activated. Izi zili ndi porous chimango chomwe chimakwirira mozungulira 140,000 m² Malo amkati, ofanana ndi kukula kwa mabwalo a mpira 20.

Ma nitrogen oxides akangofika pa kaboni, ena amakakamira m'mabowo ndipo amakopeka pamenepo. Mbali ina imakhudzidwa ndi chinyezi chomwe chili mumlengalenga, kupanga nitrous acid, yomwe imatsaliranso mu fyuluta. Kuonjezera apo, poizoni wa nayitrogeni woipa amachepetsedwa kukhala nitrogen monoxide m'njira yochititsa chidwi. Izi zikutanthauza kuti mann + Hummel tinthu fyuluta amatha kuchepetsa mpweya woipa ndi fungo losasangalatsa ndi 90% poyerekeza ndi wamba tinthu fyuluta.

Combifilter imatchinganso fumbi labwino ndipo zosefera za biofunctional zimasunga ma allergen ndi ma aerosols a virus pomwe zokutira kwapadera kumalepheretsa kukula kwa mabakiteriya ndi nkhungu.