Ultrasonic 0.5 gal Cool Mist HumidifierHoneywell Ultrasonic 0. 5 gal Cool Mist Humidifier Ultrasonic, Cool Mist 1. 89 L Tank. Product Type Humidifier Manufacturer Part Number HUL520WC Manufacturer Website Address http: www. kaz. com Marketing Information Humidifier increases the moisture in the air to help breathing and dry skin issues as well as limit viruses and bacteria that live in dry air. 1 2 gallon (1. 89 L) unit runs for up to 12 to 18 hours, providing small rooms with quiet