Compatible with a wide range of humidifier models, including HCM300, HCM300T, HCM305T, HCM310T, HCM315T, HCM350, HCM350B, HCM350W, HCM350BCST, HCM450BCST, HCM500, HCM530, HCM535, HCM53520, HCM540, HCM550, HCM55019, HCM551, HCM560, HCM600, HCM630, HCM631, HCM632, HCM632TG, HCM635, HCM640BW, HCM645, HCM646, HCM650, HCM700, HCM710, HCM1000, HCM1000C, HCM1010, HCM2000, and HCM2000C. Key Benefits and Features: Designed for performance and longlasting use with the specific humidifier models listed above, ensuring a precise fit and reliable operation. Prefilter blue layer effectively captures impurities, helping to extend the life of the main filter and maintain cleaner air output. Supports healthier indoor air by reducing airborne particles, creating a fresher, more comfortable living space for you and your family. Constructed from quality imported blue filter paper with a diamondpattern grid for enhanced airflow, filtration efficiency, and durability. Upgraded blue grid design improves performance and ensures the filter remains clean and effective during use. Easy to install and , with no special tools required. Recommended replacement interval of every 12 months for results, maintaining humidifier efficiency and air quality. Includes four filters, providing a convenient supply for ongoing maintenance and eliminating the need for frequent purchases. Practical Applications: 1. Ideal for households looking to keep indoor air moisture levels safe and healthy during dry seasons or in heated environments. 2. Suitable for families with members sensitive to dust or airborne particles, helping reduce irritants in the living space. 3. for maintaining performance in humidifiers used in bedrooms, living rooms, nurseries, or home offices. Specifications: Material: Imported professionalgrade blue filter paper Structure: Diamondpattern grid for strength and airflow optimization Quantity: Pack of 4 filters Replacement Interval: Every 12 months recommended Compatibility: Fully matched to listed HCM humidifier models for precise fit and function This filter set offers a balance of performance, durability, and ease of use, ensuring your humidifier delivers clean, fresh moisture to your indoor environment.