The Blueair 400 series air purifiers feature patented HEPASilent filtration technology to remove household allergens and irritants. HEPASilent filters work together with electrostatic filtration to eliminate 99.97% of all particles 0.1 microns or larger. Replace your HEPASilent 400 filter every six months to maximize performance. 1 Replacement Blueair 400 series HEPASilent particle filter F400PA
Reviewed by: Parents of an allergy suffer from Washington DC
When our son moved back to the area we were concerned about his allergy to cat dander now that he would be visiting more frequently. We were very satisfied with the filters for dust allergies but the cats posed a different problem. Our worries were unnecessary. The Blueair 400 filters did a fantastic job - even when the cats decided to jump in bed with our son. We highly recommend these filters and the Blue Air purifier.
Reviewed by: g. norris...allergies since birth from Marietta, Georgia
I have used the Blueair purifier and filters for 6 years now and have added two more to the original....all of my filter products come from Achoo....ah, sweet, clean air and relief...
Blueair 400 series filter
Reviewed by: Susan from New Hampshire
We have two of these machines in our offices and they work great. The filters are changed every 6 months. I suffered with severe asthma due to building conditions and this filter has made a major difference in my breathing in the office. Very quiet too. Worth every penny.
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