Aprilaire - This replacement water panel evaporator fits models 400, 400A, and 400M. Water panel evaporators are the heart of your humidifier, designed specifically to deliver the proper humidity necessary to keep you comfortable throughout the heating season.

• Manufacturer: Research Products Corp.
• Brand Name:   Aprilaire
• Description:   Aprilaire Water Panel Stock No. 45  (2-Pack)
• Part Number: No. 45
• Compatibility:  Aprilaire 400, 400A, 400M, 400MK
• Nominal Size:    10″ x 12.75″ x 1.5″
• MERV Rating: not applicable
• Water panel slides into the scale control insert, and the water distribution tray sits across the top of the panel
  
• Replace water panel twice per season