Broad Compatibility: Our WF813 humidifier filters are designed to be highly versatile and are compatible with various models. They are an perfect choice for WF813, for EQ-2119-UL EQWF813, for PCWF813 PCWF-813 PCCM-832N PCCM-840, for Relion RCM-832 RCM-832N, for , for Robitussin humidifiers and SH100 & SH200. Precise Dimensions: This replacement filter measures approximately 5.51 x 3.86 x 1.5inches. It's recommended to compare the size with your old humidifier filter for perfect fitting. Effortless Installation: Owing to the of these filters, replacing your old filter is a breeze. Simply discard the old one and fit this new one in its place. To maintain the best performance of your humidifier, we recommend changing the filter every 2-3 months. Premium Quality: We utilize a natural multilayer hydrophilic fabric in the making of our humidifier filters. This ensures excellent moisture output while the incorporation of aluminum foil in the middle provides enhanced stability and durability. These filters give a high filtration efficiency and an extended service life. We humidifier filter, made of natural fabric, multi-layer mesh to maximize the output of humidifier moisture, but also better filter Limescale, the new upgraded material makes the filter more stable and filtering, can be used for a longer time. Colour:White Material:Plastic Package Contents: 2 * Humidifier Filter WF813 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.