The Venta LW15 Original Humidifier humidifies dry room air in spaces up to 300 square feet (with standard 8-foot ceilings) using evaporative humidification. As a disk stack rotates in the water reservoir, clean water evaporates to humidify the air in your space. This cold evaporation process is recognized as the best humidification method. By implementing the principle of humidifying air for homes and offices without the use of filters, the Venta Humidifier is hygienic, simple to use, and easy to clean. Properly humidified air will also eliminate static electricity and work to preserve wooden furniture and musical instruments. Venta Humidifiers offer the consistent performance of high-end German engineering; delivering optimal indoor air quality with properly humidified air to breathe. This compact 1.4-gallon capacity humidifier is powerful enough to work with indoor spaces of up to 300 square feet, perfect for a bedroom, office, or nursery, and is designed to resist over-humidifying the interior.