Moderate Price FMDZFL 400 Replacement Filter Set, Compatible with Bissell Air400, Including 8 Pre-Filters, 2 True HEPA Filters, 1 Activated Carbon Filter, Part No# 2521, 2520.

【Compatibility】Filters Set is compatible with Bissell Air400 Air Purifier.
【Value Pack】Including 2 HEPA filters,1 activated carbon filter and 8 fine pre-filters.
【3 Stages Filtration】Pre-filter,HEPA and carbon filter efficiently remove household large and fine particles for fresher air
【Part Number】The pre-filter and HEPA filter compares to part #2521 and the carbon filter compares to part #2520
【Replacement Frequency】It is recommended to replace the HEPA filter every 6-12 months and to replace the pre-filter and carbon filter every 3 month.