The Aprilaire Scale Control Insert #4640 is the U-shaped component which encases the Water Panel Evaporator and is used in combination with water panel #10 and water distribution trap #4331. It is also part of the maintenance kit #4792.

• Actual Measurements: 11.143H x 3.44W x 10.44D (inches)

Compatible Models

• 500
• 500A
• 500M