Save money with a generic equivalent! Honeywell HC22E 1003 Humidifier Pad, 10-Pack The “heart” of your whole-house humidifier, the Water Panel (also known as humidifier filter, water pad, evaporator pad), should be changed at least once per heating season. The pad is constructed of an expanded aluminum honeycomb mesh that is dipped in a clay coating. This coating is able to absorb and hold water. Warm, dry air is forced through the wet pad to introduce water vapor into the home. Product Features: Factory original OEM part Dimensions approximately – 10″ x 13″ x 1 1/2″ Pad change instructions are printed on product carton Agion Antimicrobial Coated Fits the Following Humidifiers: Honeywell HE260A Honeywell HE260B Honeywell HE360A Honeywell HE360B Honeywell HE365A Honeywell HE365B Honeywell HE300A Honeywell HE200A Honeywell HE250A Humidifier water panels (sometimes referred to as a filter) are a regular replacement item in whole-house humidifiers. For the best performance we recommend that the Water Panel be replaced once a year, either prior to the start or at the end of the heating season. If you have especially hard water – the panel can be replaced 2 times per year.