Great Compatibility: WF2 humidifier filters replacement compatible with a wide range of humidifiers. It fits Starry Night cool mist humidifier and vaporizer models: V3100, V3500, V3600, V3700, V3800, V3850, V3850JUV, V3900, V3900JUV, and the VEV400 series. It also fits 3020; SCM1118, SCM1119, SCM1120; HCM300T, HCM315T, HCM350, HCM350B, HCM630, HCM631, HCM645, HCM650, HCM1000, HCM2000, HCM540 series, and HCM710. Replace part WF2 PWF2. High Efficiency Performance: Our WF2 humidifier filter delivers excellent performance in improving air quality. It effectively removes minerals and pollutants from hard water to reduce white dust and retains essential mineral elements. While humidifying the air, it diffuses moisture to improve sleep quality, keep skin moisturized, prevent sore throats, and help relieve discomfort caused by dry environments. Superior Quality: This WF2 humidifier filter replacement features hot glue strips and a dense construction made from high-quality, environmentally friendly filter paper. Designed with an advanced lower density structure technology, it matches the original specifications and ensures maximum surface area for efficient moisture dispersion with minimal airflow resistance. The eco-friendly material provides optimal performance, delivering healthier and more comfortable air. Package: The package includes 4 x WF2 humidifier filter replacements. It is recommended to clean the filter monthly and replace every 2 months depending on usage and water hardness for optimal performance. Warm Tips: Before using the WF2 wicking filter, make sure to soak it in water. This step ensures your humidifier delivers consistent moisture. Material: Wood pulp paper. Color: As shown. Package Contents: 4 x Filter. Note: Light reflection and different displays may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.