Filter-Monster Replacement Compatible with Bissell 2521 Filter for air400 Air Purifiers, 3 Pack

Included pre-filter acts as first layer of filtration to capture larger particles before reaching filter, such as dust and hair Filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including smoke, dust, pollen, pet dander, mold spores and dust mite debris Compatible replacement with Bissell 2521 Filter Easy pull tabs for simple replacement