Mammoth Air Purifier HEPA Carbon Filter (7 Stage, Q3 Purifier) Mammoth Air Purifier OEM Filter Direct Replacement of Mammoth Q3 - 7 Stage Air Purifier (can also work with 4 stage) Mammoth Ice-Tech filter is made with the high efficiency materials to improve air flow and filtration. Filter is combined with - Pre-Filter, 99.97% HEPA Filter, Odor Absorbing Carbon Filter, and Photocatalytic Oxidation Filter VOC and Ozone Free