HODSEUKIN H13 HEPA Replacement Filters Compatible with Blueair Blue Pure 511 Air Cleaner Purifier, 2 Pack (Blueair Blue Pure 511 2-Pack)

Compatible for 511 Air Cleaner Purifier. Dual filtration design with activated coconut carbon layer.High-Efficiency filter Smoke, multiple odors filters Filtration effect is 4 faster than the other filters. 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 quality around you. Energy saving air filters save energy due to a low-density design and requiring less pressure to push air through the filters