Honeywell HC14 Replacement Filter For Holmes Cool Moisture Humidifier Keep your Honeywell Holmes Cool Moisture Humidifier in good working order with this single replacement filter model HC14. The Protec Antimicrobial Treatment helps prevent the growth and migration of mold, fungus, algae and bacteria on the filter. The filter material is reinforced for maximum efficiency and longer filter life, plus the Dry Lift Handle helps to keep hands dry and clean while changing your filter. This filter is also equipped with an Air Washing prefilter to help trap dust before it enters the filter.