Honeywell HCM350 Germ Free Cool Mist Humidifier The Honeywell GermFree Cool Mist Humidifier HCM350 features an automatic moisture balance system and 3 moisture output settings to eliminate dry air in mediumsize rooms. This humidifier continuously works to eliminate up to 99.9 of waterbred germs and bacteria for clean, healthy moisture. This system utilizes a germicidal chamber to eliminate bacteria and other airborne allergens, including mold and spores, making this perfect for those with sensitive allergies.