Compatible with WF813, RCM-832, RCM-832N, RWF813, PCWF813, PCCM-832N, PCCM-840, AC813, EQWF813, EQ-2119-UL, SH100, SH200, -830, -832, ACR-832, D13-C, and -832 humidifier models. High-quality humidifier wick filter constructed from premium materials. Features a durable, fine, multi-layer mesh design with natural hydrophilic fabric to maximize moisture output. Easy to install: Fill the humidifier tank with distilled water for best results. To replace, open the cover, remove the old wicking pad, insert the new filter in the same position, and close the cover securely. For optimal performance, replace the filter every 23 months depending on usage and water hardness. Effectively captures minerals from hard water and promotes even, thorough moisture distribution. Pack includes 4 replacement humidifier filters. Filter dimensions: 5.6 x 3.75 x 1.62 inches. Color: As shown Material: Wood pulp paper Package contents: 4 x humidifier replacement filters Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.