1. The sealed two-stage 360-degree filtration system consists of a Hepa filter and an activated carbon filter. Can effectively filter 99.97% of contaminants as small as 0.1 microns. The most beneficial protection for allergy, rhinitis patients and young children.2. The activated carbon filter in this kit contains more activated carbon particles than other products. The adsorption effect of activated carbon particles can better enhance the filtering effect of the air purifier. Due to the large number of activated carbon particles, it is second to none in removing odors. Fresh air for you and your family.3. Filters are easy to install and washable. After washing with warm water and drying in the sun, the performance of the air purifier can return to its best condition. It gives you 12 months of long-term protection.4. For Dyson Air Purifier Filter, Hp04 Tp04 Dp04 Tp05 Hp05 Purifying Fan 5.It is recommended that you replace the filter every 6-12 months to prolong the life of your Dyson air purifier.