Reasons why a Heat exchanger would plug up?

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Yngwie_69

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Im changing a 13 year old heat exchanger in a furnance, and was wondering why it rusted and plugged up in the first place? Its the second heat exchanger with the smaller fins.... My only guess would be if the unit was slopped backwards and condenstate built up there
 

Tom Sawyer

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Im changing a 13 year old heat exchanger in a furnance, and was wondering why it rusted and plugged up in the first place? Its the second heat exchanger with the smaller fins.... My only guess would be if the unit was slopped backwards and condenstate built up there

Insufficient firing rate
Moist environment
Excessive draft
 

Reach4

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Dust making it past the air filter? I am presuming it was the air side that clogged.
 
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