The AprilAire H445EZ1A is an all-in-one replacement kit (2-pack) for AprilAire Whole-House Humidifier Models 400, 400A, and 400M. The water panel is constructed from heavy-duty paper, reinforced with two layers of aluminum, and coated with an anti-microbial agent to prevent biological growth. This genuine AprilAire replacement helps maintain optimal humidity levels (40-60%) to reduce the incidence of respiratory issues and protect household items susceptible to dry conditions. The assembly measures 10" H x 13" L x 1.75" W and is recommended to be replaced twice per heating season

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