For rooms up to 400 square feet, the Venta LW25 Airwasher humidifies dry room air while simultaneously purifying it by removing dust, pollen, pet dander, and other airborne pollutants down to 0.3 microns in size. The Venta Airwasher is both a filter-free evaporative humidifier and filter-free air purifier, all in one lightweight unit. Additionally, Venta Airwashers do not produce the white dust common with other humidifiers due to the fact that we use Cold Evaporation technology. By implementing the principle of humidifying and purifying air for homes and offices without using filters, the Venta Airwasher is hygienic, simple to use and easy to clean. Using a Venta Airwasher will help to reduce common cold symptoms caused by dry air such as dry skin, chapped lips, and sinus congestion. Keep allergies under control against dust mites, animal dander, and pollen. Perfect indoor air quality cleansed by a Venta Airwasher helps to improve concentration and reduce headaches. Properly humidified air will also eliminate static electricity and work to preserve wooden furniture and musical instruments. Venta Airwashers offer the consistent performance of high-end German engineering; delivering perfect indoor air quality with both humidified and cleaner air to breathe. This compact 2-gallon humidifier is powerful enough to work with indoor spaces of up to 400 square feet, perfect for a living room or master bedroom, and is designed to resist over-humidifying the interior.