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. It is highly recommended that you change a Honeywell Air Purifier R Filter annually for optimal performance. Establish an unrivaled breathing experience for yourself & your loved ones with Honeywell HEPA Filters. Air Purifier Filter Type: HEPA; Filtration For: Dust; Dust Mite Debris; Pet Dander; Pollen; Smoke; Air Cleaner Compatibility: Honeywell Series HPA090; HPA100; HPA200; HPA250; HPA300; HPA3100 to HPA3300; HPA5100 to HPA5300; HPA8350; Width: 6.5".