311i MAX Replacement filter suitable with BLUEAIR Blue Pure 311i Max Air Purifier F3MAX, H13 True HEPA 2-in-1, 2Pack, by HODSEUKIN.

Energy saving air filters save energy due to a low-density design and requiring less pressure to push air through the filter. Please replace regularly to keep your machine fresh， Recommended to change filter once every 6 months, Also the filter's usage time will depend on the environment air premium around you. True H13 Hepa The filtration efficiency reached 99.7% pellet. Replacement High-efficiency H13 HEPA Filter. 2-Stage Filtration High-efficiency Activated carbon Air Clean Dust