The LW45 Venta Air washer Humidifier/Air Purifier humidifies dry room air while simultaneously purifying it by reducing dust, pollen, pet dander and other allergens. Venta Air washers do not use filters; water is the filter. This makes the Air washer easy to maintain and clean. Additionally, Venta Air washers do not produce the "white dust" common with other humidifiers due to the fact that it uses cold water evaporation technology. Designed for rooms up to 800 sq. ft. this Air washer has a 3 Gal. capacity. This Venta Air washer has 3 Speeds and also features Auto Shut-off. This 2-in-1 Humidifier/Air Purifier is perfect for any type of room. For areas up to 800 sq. ft. This 2-in-1 Humidifier/Air Purifier features a patented disk stack system, which draws air into the unit and pushes it through sheets of water, washes dirt and dust out of the air, leaving nothing but cleaner, humidified air in the surrounding indoor space. This advanced air washer technology and top of the line German engineering allows for you to have the best air purifier benefits on the market today.