BestAir Furnace Humidifier Water Pad. It is made of sturdy metal and measures 10" lengthx9-1/2" width. This water pad is suitable for Aprilaire Humidifiers Models 110, 220, 550, 550A, 558, 10, Chippewa Model 220, Lasko 5000L, Honeywell HE220A, HE220B. For optimal performance, it is recommended to replace the water pad at least once per season.

• Fits Aprilaire Humidifiers Models 110, 220, 550, 550A, 558, 10, Chippewa Model 220, Lasko 5000L, Honeywell HE220A, HE220B.
• Made of metal
• Measures 10 inches in length and 9-1/2 inches in width.