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Genuine Aprilaire OEM replacement water panel evaporator (or humidifier pad) #12 for models 112, 136, 224, 440, 445 and 445A and Chippewa Models 224 and 225. 

• We generally recommend replacing this evaporator panel once a year.  You may need to replace the panel more frequently if you have hard water. 
  
• The water panel slides into the scale control insert and the water distribution tray sits across the top of the panel.  
• The dimensions of the water panel 11 1/2" x 14 3/4" x 1 3/4"