Product review (4 stars): Installation is easy. Loosen a few screws
I have been ordering this humidifier pad from Amazon for years. Installation is easy. Loosen a few screws, remove the old one and replace it with a new one. They recommend replace it twice every heating season. You can see how much dirt and slime it traps when you replace the old one. This is such an inexpensive investment to keep your system going efficiently.