Replacement humidifier filter. Helps remove minerals and pollutants from water and reduces white dust left behind. Treated with Protec antimicrobial treatment to help prevent the growth and migration of mold, algae, and bacteria on the filter. Inhibits up to 99.99% of mold growth. Features an optimized design to maximize moisture output. Fits Honeywell HEV615 series and HEV620 series.