The True HEPA Replacement Filter R captures 99.97 percent of airborne particles as small as 0.3 microns to help you establish a cleaner breathing experience for you and those around you. Plus, its advanced design delivers cost-efficient performance by providing up to one year of filtration before replacement is required. Replacement Filter R is designed for use with Honeywell HPA090 series, HPA100 series, HPA200 series, HPA250 series, HPA300 series, HPA3100 to HPA3300 series, HPA5100 to HPA5300 series and HPA8350 series air purifiers (sold separately). This product ships in approximately 1 days