Question:medium

High excess air in a furnace combustion process generally

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Excess Air Rules of Thumb:
• Too little air \(\implies\) Incomplete combustion (Smoke, soot, and CO formation; dangerous and wasteful).
• Too much air \(\implies\) High stack losses (Heating unnecessary nitrogen that carries heat right out the chimney, dropping efficiency).

Updated On: Jun 25, 2026

Increases furnace efficiency
Decreases furnace efficiency due to stack losses
Increases flame temperature
Reduces fuel consumption

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The Correct Option is B

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