This genuine Aprilaire replacement water panel is the backbone of your Aprilaire humidifier. The heavy-duty aluminum mesh frame holds its shape over the life of the water panel as the porous ceramic-type coating absorbs water and maintains the right kind level of hydration to give a boost to the evaporation process. Water is vaporized as air warmed by the furnace passes over the water panel. The humidified air is carried through the home in the course of the air ducts.
From the Manufacturer
Water Panel Evaporators are the guts of your humidifier and the component which generates the necessary humidity to keep you comfortable throughout the heating season. The water panel slides into the dimensions keep watch over insert and the water distribution tray sits around the top of the panel.