Carbon Pre-filter This activated carbon basedpre-filters are utilized in Air Purifiers to capture airborne gases, VOCs (volatile organic compounds) and odors. With a muchhigher active carbon concentration and density, odor problems from cooking, pets, smokers, microbial VOC or other sources can be eliminated or minimized very effectively. Features: 1.Highcarbonconcentrationandhighperformanceefficiency 2.Eliminatesmanycommonhouseholdodors,VOC(volatileorganiccompounds)andhouseholdchemicalsmells. 3.Easytoinstallandlightweight 4.LongerservicelifecanbeachievedwhenusedafteraHEPAfilter. 5.Lowpressuredropandhighairpermeability. 6.GreatlyreducecostwhencombineHEPAwiththisfilterintoone. 7.Tailor-madesizesforwideapplication.