Honeywell HEPA Air Purifier R Filter helps capture 99.97% of the following airborne allergens and particles: dust, pollen, pet dander, dust mite debris and smoke.* To ensure efficiency and performance, it’s important to replace HEPA air filters 1x per year. This Honeywell HEPA Filter is designed exclusively to fit Honeywell HEPA filter air purifiers HPA094, HPA100, HPA200, HPA250, HPA300, HPA3100, HPA3300, HPA5100, HPA5200, HPA5300, HPA8350 Series. Honeywell Air Purifiers with Honeywell certified filter will filter and circulate air up to 4.8 times an hour in the stated room size.** If you have pets or stale indoor air, HEPA air purifiers help deliver cleaner, fresher air. Always purchase Genuine Honeywell air purifier replacement filters. These HEPA air filters for home are independently tested and certified. They are great for allergy sufferers, pet owners, homeowners, and those wanting cleaner air. Disclaimers: * From the air that passes through the filter, 0.3 microns and larger. ** Based on 3rd party independent CADR testing for the smoke CADR value when operated at the highest level. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter.