The water panel is constructed using an expanded metal mesh covered with a special coating that absorbs water and removes mineral deposits.

All Fits the Following:
•Honeywell Model HE260A, HE260B, HE265A, HE265B, HE360A, HE360B, ME360, HE365A, HE365B Humidifiers (equivalent to #HC26A1008, HC26E1004, HC26P - does not contain anti-microbial coating like the Enviracaire Elite panels)
•Lennox HCWB2-17, HCWP-18
•Nordyne 917863, 917864

For best performance, change at least once per season, maybe more depending on water conditions and frequency of use.

Dimensions Approximately 10" W X 13" H X 1 5/8" D