Air Innovations Cool Mist Humidifier for Medium Rooms &ndash; MH-513 Black Add moisture and make your home more breathable with the Air Innovations 1.1 Gallon Cool Mist Ultrasonic Humidifier Designed to operate quietly for uninterrupted sleep. For rooms up to 400 sq. ft. Variable mist settings. Permanent ceramic filter. Provides moisture for up to 70 hours on the low setting. 1-year limited manufacturer's warranty.