Aprilaire #4640 Scale Control

Part Number: APRILAIRE4640O

Retail Price per Filter: $29.99
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The Aprilaire 4640 is a humidifier insert that keeps your humidifier system working at its best. This product works with your 500 series model humidifier and will keep mineral scale out of the water. This will prevent buildup and other contaminants from being released into the air you breathe.

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