AprilAire 4403 Scale Control Insert with Float Chamber for Model 400 Humidifiers

The AprilAire 4403 Scale Control Insert is a genuine OEM replacement component designed for AprilAire Model 400 series humidifiers. This U-shaped water panel frame encases the water panel evaporator and includes an integrated float chamber for reliable operation.

Key Features:

• Directs mineral buildup and scale deposits back into the water panel for efficient disposal
• Prevents water from escaping the evaporative section and entering other humidifier components
• Integrated float chamber ensures proper water level control
• Made in the USA with quality OEM construction
• Backed by a 5-year manufacturer warranty

Compatibility: Designed for AprilAire humidifier models 400, 400A, 400K, 400M, 400MK, 400MZ, 400Z, 400KZ, 400MKZ, and 4788.

This scale control insert works in conjunction with Water Panel Number 45 and Water Distribution Tray Number 4407 (sold separately) to maintain peak performance of your whole-home humidification system. Regular replacement of this component helps ensure efficient humidifier operation and prevents mineral scale buildup from affecting system performance.