Great Compatibility: WF2 humidifier filter replacement compatible with a wide range of humidifiers, including Kaz, Honeywell, Enviracaire, and ReliOn. Fits Starry Night cool mist humidifiers and vaporizers: V3100, V3500, V3600, V3700, V3800, V3850, V3850JUV, V3900, V3900JUV, and VEV400 series. Also fits Kaz models 3020; SCM1118, SCM1119, SCM1120; Honeywell models HCM300T, HCM315T, HCM350, HCM350B, HCM630, HCM631, HCM645, HCM650, HCM1000, HCM2000, HCM540 series, and HCM710. Replacement part number: WF2, PWF2. High Efficiency Performance: This WF2 humidifier filter helps improve air quality by reducing mineral deposits and contaminants from hard water, minimizing white dust. It maintains beneficial minerals while adding moisture to the air, supporting better sleep, skin hydration, and relief from dry-air discomfort. Superior Quality: Made from high-quality, environmentally friendly wood pulp paper with hot glue strips and a dense, low-density structure. Designed to match original equipment specifications for optimal surface area and moisture dispersion. Environmentally Friendly Material: Ensures safe, healthy, and comfortable indoor air. Great Value Pack: Includes 4 WF2 humidifier filter replacements. Recommended replacement every 2 months, depending on usage and water hardness. For Kaz models, soak the filter in water before first use to ensure proper wicking performance. Material: Wood pulp paper Color: As shown Package Contents: 4 x filters Note: Actual color may vary slightly due to screen settings and lighting. Measurements may vary by ±1–3 cm.