This genuine Aprilaire replacement water panel humidifier filter features a porous ceramic-type coating that absorbs water and maintains the proper level of hydration to support the evaporation process. Water is vaporized as air warmed by the furnace passes over the water panel humidifier filter carrying humidified air throughout the house through the air ducts. Aprilaire has been there since the beginning by introducing the first whole-home humidifier in 1954. Since then, we've continued to focus on quality design, engineering and manufacturing to deliver Healthy Humidity to every home. Healthy Humidity reduces the incidence and risk of respiratory infections from airborne viruses. It also helps remedy your dry skin, chronic sore throat, frequent nosebleeds and static shock. Additionally, proper humidity levels protect your home's wood furnishings from cracking or splitting while lowering your energy bill. Keep your Aprilaire Humidifier running at peak performance by replacing your water panel. Maintaining proper humidity levels is integral to maintaining Healthy Air.