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Aprilaire Scale Control Insert 4403 - For Model 400

The Aprilaire Scale Control Insert 4403 is the U-shaped component which encases the Water Panel. It directs any built-up mineral deposits back into the water panel, and it prevents water from leaving the wet-pack section and entering another portion of the humidifier. Used with the water panel number 45, and the distribution tray number 4407. Also see the maintenance kit part number 4788.

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