Mist-free evaporative humidification for spaces up to 485 ft² including adjoining spaces that cannot be closed off such as hallways, lofts, and stairways. Based on standard 8-foot ceilings. Healthy air humidified to an optimal 40-60%. As a disk stack rotates in the water reservoir, clean water evaporates to humidify the air in your space. Allow the unit to run continuously for the first 7-10 days on the highest speed. Safe for use with tap water. Naturally reduces harmful pollutants in the air at a humidity level of 40-60% without the use of filters. Includes a built-in digital hygrostat for measuring and controlling relative humidity. The interactive touch display features an auto mode which allows you to preset a target relative humidity level, as well as a sleep mode which dims the screen and reduces the fan speed.