The 9 gallon Honeywell QuietCare humidifier quietly helps soothe dry air discomforts. Multiple humidity control options. Runs up to 3 nights per filling and is perfect for the whole room. Air Washing filter helps capture dust and pollen. Plus your humidifier stays cleaner longer with Protec Continuous Cleaning which includes a Protec Cleaning Cartridge to help provide fresher cleaner mist and a Protec Antimicrobial treated filter to help prevent the growth of mold and bacteria on the filter. Large Casters for easy movement. Tank window for easy monitor of water level. Up to 30% quieter.