Product Description: Mesh Structure Design: Natural hydrophilic fabric multi-layer mesh maximizes the moisture output of your humidifier. At the same time, it also helps control dust and dirt buildup inside the humidifier. Aluminum Foil in Middle: According to the customers' suggestions, we newly upgraded the material of the filters. The aluminum foil in the middle can make our filters have stronger stability and filterability, and can be used for a longer time. Perfect Fit: Our humidifier filter replacement is perfect fit for Equate EQWF813, EQ 2119-UL; Re-lion WF813, RCM-832, RCM-832N; ProCare PCWF813, PCWF-813, PCCM-832N, PCCM-840; Duracraft/Robitussin DH-830, DH-832, AC-813, ACR-832, D13-C, HC-832; Sesame Street SH100 & SH200, etc. Natural hydrophilic fabric multi-layer mesh maximizes moisture output of your humidifier Upgraded aluminum foil material enhances stability and filterability for longer use Compatible with various models including Kaz WF813 Re-liOn WF813 ProCare WF813 Equate EQWF813 and Duracraft humidifiers Filter size approximately 5.6 x 3.75 x 1.62 verify size compatibility before purchasing Easy installation simply replace the old filter with the new one