Bionaire Ultrasonic Warm and Cool Mist Humidifier (BUL9500-SHP) Ultrasonic humidifier disperses both warm and cool mist. Warm And Cool Mist Helps alleviate sinus irritation and chapped skin caused by dry air 2-gallon capacity ideal for medium to large rooms 3 humidity output settings offer ideal comfort level Demineralization cartridge included; no filters needed