Filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including smoke, dust, pollen, pet dander, and more Recommended to replace every six (6) months, or more often in harsh environments, for maximum efficiency Fits Kenmore Small Room Filter Air Purifier: 83394 Genuine Kenmore replacement 83187 filter removes smoke, dust, pollen, pet dander, and more from the air.