Having the proper humidity level during dry winter months keeps indoor air pleasant and comfortable. The Bionaire® Cool Mist Tower Humidifier is designed with a multi-functional display to automatically monitor and maintain your ideal humidity level. The long-life washable filter lasts 3 times longer than standard evaporative wick filters*5. In addition, the humidifier is treated with anti-microbial properties*4 to help protect against bacterial growth and to eliminate odors. Recommended for medium-sized rooms.