BestAir whole house humidifier replacement water pad uses up to 50% less water than a standard metal pad. Water pads are crafted to generate higher output and stronger absorption. Replace at least twice per season.. Brand/Model Compatibility: Aprilaire 350, 360, 560, 560A, 568, 600, 700, 760, 760A, 768; Honeywell HE200A, HE250A, HE260A/B, HE265A/B, ME360, HE360A/B, HE365A/B; Lennox WB2-17, WB2-17A, WP2-18, WP2-18A. Pack Size: 2. Returnable: 90-Day. Air Filter Size: (Custom Size). Product Depth (in.): 3.5 in. Product Height (in.): 13.125 in. Product Thickness (in.): 1.5 in. Product Width (in.): 10.25 in