Replacement scale control insert.The Aprilaire 4403 scale control insert is commonly called a filter or pad frame. It is located on the inside of the humidifier, and surrounds the water panel. The purpose of the insert is to act like a reservoir, holding water, which then wicks up the water panel. It also prevents mineral build-up inside the humidifier cabinet, and acts as an emergency drain should the unit overflow. The pad frame should be replaced every five to eight years - sooner if the frame is cracked or damaged.


More Information
Manufacturer Aprilaire
Product Length 14.000
Product Width 10.550
Product Height 4.900
Product Weight 0.390
Package Length 14.000
Package Width 10.550
Package Height 4.900




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