I clean Air Purifier R2 Hepa Filters, 2 Packs for Honeywell HEPA R Filter (HRF-R2) Fits models in the HPA090 series, HPA100 series, HPA200 series, HPA300 series. Includes 2 pack HEPA filter, product dimension: 10-1/5"(L) x 6-1/2"(W) x 1-1/2"(H). Replacement for Honeywell HEPA filter R captures up to 99.97% of particles as small as 0.3 microns in size from the air passing through the filter. For best performance replace once per year or as needed depending on your specific conditions