Key Features Perfect for Large Spaces - With a 21 L / 5.5-gallon water tank, this whole-house humidifier delivers continuous operation for up to 40 hours on the lowest speed setting. Designed for areas up to 2200 sq. ft / 205㎡, it is ideal for large living rooms, greenhouses, music rooms, supermarkets, and more. Customizable Humidification - Adjust the mist output between 3 levels (Low - 600 ml/h for 40 hours, Medium - 1300 ml/h for 20 hours, High - 2000 ml/h for 13 hours) to suit your needs. Th