Honeywell HPA300 Replacement Filter R

The Honeywell HPA300 uses "Filter R" (HRF-R1, sold as a 2-pack) as its True HEPA replacement filter. Honeywell recommends replacing it about once a year with typical use — noticeably weaker airflow or a musty smell from the unit are both signs it's overdue sooner than that. Filter R is sold in 1-pack and 2-pack sizes; buying the 2-pack lowers the effective cost per replacement since you're not paying for separate packaging and shipping twice. /out/page_art_74f6ecd0e847/B01N8VJ2NF As an Amazon Associate, Replenish earns from qualifying purchases made through links on this page.