The R Filter and A Pre-Filter Value Pack for HEPA Air Purifiers for Large Rooms includes a year supply of Certified Honeywell HEPA Filters and Genuine Pre-Filters for Honeywell HEPA Air Purifier models in the HPA200, HPA250, HPA5200 series. HEPA filters are certified to help capture up to 99.97% of the following microscopic airborne allergens and particles as small as 0.3 microns: dust, pollen, pet dander, dust mite debris and smoke.