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Home > categories > Machinery & Equipment > Heat Exchanger > What is the function of the secondary heat exchanger in a 90% efficient furnace?

Question:

What is the function of the secondary heat exchanger in a 90% efficient furnace?

What is the function of the secondary heat exchanger in a 90% efficient furnace?

Answer:

to transfer heat that was going up the chimney back into the plenum.

to recapture excess heat that would normally go up the chimney

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