WaterFiltration Elements (4Pack): 170*240*30mm replacement filters designed to improve air quality by trapping dust, particles, and impurities that can affect your breathing environment. Compatible with Vicks humidifiers including models 3020, V3100, V3500, V3500N, V3600, V3800, V3850, and V3900. Easy Installation Design: Remove the old filter and insert the one without tools. The intuitive design allows quick replacement in seconds, making maintenance simple even for firsttime users. Regular filter changes help maintain humidifier performance. Absorption Capacity: Filters feature advanced absorption technology that efficiently captures water while filtering out minerals and impurities. The 30mm thickness provides water retention and distribution, creating a consistent mist output for improved room humidity levels. Extended Filter Life: Each pack includes 4 replacement filters, providing approximately 13 months of use per filter depending on water hardness and usage frequency. This multipack value means fewer purchases and continuous operation of your humidifier throughout the season. Use Scenarios: In bedrooms or nurseries to maintain comfortable humidity and air quality during dry seasons. In offices or shared workspaces to sustain steady humidity and reduce dust on surfaces and equipment. In homes with hard water to minimize mineral buildup in the mist and support longer humidifier life.