The heat exchanger is a vital part of your home's furnace. It conducts the heat from the burner chamber to the blower so that the warm air can be spread around your home. Corrosion can lead to cracks, which will destroy the heat exchanger.
Causes
There are two main causes when it comes to rust and corrosion on the exchanger: condensation and vibration.
Condensation
Condensation will most likely damage the outside surfaces of the tube bundles that make up the main body of the furnace heat exchanger.
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