Filter-Monster True HEPA Replacement Compatible with Bissell 2521 Filter for air400 Air Purifiers; 3 Pack

Replacement compatible with Bissell 2521 filter. Engineered to fit Bissell air400 air purifier; series 24791. Pre-filter acts as first layer of filtration to capture larger particles before reaching HEPA filter. Also removes harmful VOCs and household odors from cooking; cleaning; smoking and pets. True HEPA filter captures up to 99.97 percent of airborne particles as small as 0.3 microns in size including smoke; dust; pollen; pet hair and dander; mold spores and dust mites. Recommended to replace HEPA and pre-filter every 6 months for maximum efficiency; or more often depending on air quality and environmental factors. Package contains (3) HEPA filters with (3) attached pre-filters. Dimensions: 15.75 x 13.38 x 1.38 inches each.