Honeywell Repl HepaClean Replacement Filter, 1, Black Helps capture up to 99% of microscopic allergens, 2 microns and larger, from the air that passes through the filters For best performance replace dual action filter every 4 months Fits Honeywell tabletop and tower models: HHT270W and HHT290 Series Package contains one dual action hepa-type filter To ensure stated product performance, use only genuine Honeywell replacement filters