Broad Compatibility: Our WF813 humidifier filters are designed to be highly versatile and are compatible with various models, including WF813, EQ-2119-UL, EQWF813, PCWF813, PCWF-813, PCCM-832N, PCCM-840, Relion RCM-832, RCM-832N, and Robitussin SH100 & SH200 humidifiers. Precise Dimensions: This replacement filter measures approximately 5.51 x 3.86 x 1.5 inches. It is recommended to compare the size with your old humidifier filter to ensure a proper fit. Effortless Installation: Replacing your old filter is simple and straightforward. Just remove the old filter and insert the new one. For optimal humidifier performance, we recommend replacing the filter every 2 to 3 months. Premium Quality: Made with a natural multilayer hydrophilic fabric, our humidifier filters deliver excellent moisture output. The middle layer includes aluminum foil for added stability and durability. These filters offer high filtration efficiency and an extended service life. Enhanced Design: The multi-layer mesh surface helps maximize moisture output while effectively filtering impurities such as limescale. The upgraded material improves filter stability and performance, allowing for longer use. Color: White Material: Plastic Package Contents: 2 x Humidifier Filter WF813 Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.