Hunter 30811 Solo2 HEPAtech Replacement Filter FITS HUNTER AIR PURIFIER MODELS: 30033, 30034, 30035, 30036, 30038, & 30039 Permanently charged Electric filter effectively captures over 90% of particles as small as 0.1 micron in size from the air that passes through filter. This filter pack includes one electrostatic filter and one carbon filter all in one framed unit. Brand New & Factory Sealed