Aprilaire Humidifier #12 Replacement Water Panel. Fits the Aprilaire model 112, 224, 440, 445 and 448 humidifiers.
Your humidifier water panel should be replaced at least one time per year to maintain adequate humidifier performance.

Dimensions: 11-1/5" x 14-3/4" x 1-1/2"
Actual Dimensions: 11-3/8" x 14-1/5" x 1 5/8"

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Click Here for the Aprilaire 400 / 550 / 600 / 700 Humidifier Homeowner Manual