Freegrin HEPA filter replacement compatible with RENPHO air purifier model RP-AP089. Compare to part RP-AP089-F1. 1 Filter included. Filter size dimension: 8.5 x 8.5 x 8 inches. This is not a Renpho OEM product. Renpho is a trademark or registered trademark of its respective holder. Use of it does not imply any affiliation with or endorsement by the holder. The trademark holder is not affiliated with Freegrin and does not endorse this product. Any use of the name Renpho or model designation for this product is made solely for purposes of demonstrating compatibility. It is recommended to replace the filter filter every 6-12 months depending on using environment It is recommended to replace the filter filter every 6-12 months depending on using environment