The heavy-duty paper panel is reinforced with 2 layers of aluminum and coated with an anti-microbial agent to prevent the growth of biologicals. The panel 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. The humidified air is carried through 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.

Designed to evaporate as much water as possible throughout the humidifier to maintain proper humidity throughout the home

Convenient 2-pack lasts 2-years

Lasts up to 1-year for optimal performance

Proper humidity in your home has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria， viruses， fungi and dust mites

For Whole-House Humidifier Models 400， 400A and 400M