Honeywell HEPA Air Purifier Filters are fully capable of capturing an astonishing 99.97% of airborne particles at 0.3 microns from any air passing through the filter. This package includes 2 Honeywell R Filters. The Honeywell Type R Filter is compatible with the HPA090 series, HPA100 series, HPA200 series, HPA250 series, HPA300 series, HPA3100-HPA3300 series, HPA5100-HPA5300 and HPA8350 series. It is highly recommended that you change a Honeywell Air Purifier R Filter annually for optimal performance. Establish an unrivaled breathing experience for yourself and your loved ones with Honeywell HEPA Filters.