This 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 the Certified HEPA Filters 1x per year. This Honeywell HEPA Filter is designed exclusively to fit Honeywell HEPA Air Purifier models HPA090, HPA100, HPA200, HPA250, HPA300, HPA5200, HPA5220 HPA5250, HPA5300, HPA5350, HPA8350 Series. A Honeywell Air Purifier with a 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, air purifiers help deliver cleaner, fresher air. Always purchase Genuine Honeywell replacement air purifier filters. They are certified to help capture odors and the following microscopic allergens and particles: dust, pollen, pet dander, dust mite debris, and smoke. Other compatible filter replacements are not guaranteed to offer the same performance or efficiency. 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.