Sturdy metal construction. Replace at least once per season. Replacement Furnace Water Pad fits Aprilaire 350, 360, 560, 560A, 568, 600, 700, 760, 760A, 768 (35); Honeywell HE200A, HE250A, HE260 A/B, HE265A/B, ME360, HE360A/B, HE365A/B; Lennox WB2-17, WB

Humidipad Evaporator Pad - B00NDAEKJG