Humidifier Pad Compatible Manufacturer Model Number 220 550 550A 558 Aprilaire 110 Chippewa 220 Hamilton 12HF HE220A/B HE225A/B Lasko 5000L Lennox WB2-12 Overall Depth 1 1/2 in Overall Height 9 1/2 in Overall Width 10 in Material Aluminum Includes - Pack Quantity 1 Product Type Humidifier Pad