3 Packs 511 Replacement Filters Compatible with Blueair Blue Pure 511, 2-in-1 Filter of Premium and Activated Carbon Filter

CompatibilityThe 511 replacement filter is only compatible with Blue Pure 511.Fit snugly with the machine | Value PackIncluding 3 packs 511 2-in-1 replacement filters at low cost to save your money.Note:The fabric pre-filter is not included in the package | Premium FilterOnly using premium filter to efficiently absorb most of airborne particles in your home or office | Odor FilterThe inner activated carbon filter helps to absorb unwanted odor such as pet odor,cooking odor,smoke and VOC | Replacement FrequencyWe recommend to replace the filter every 6-12 months depending on using environment and frequency