Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?
Correct answer: A. < 2
- A. < 2
- B. < 5
- C. < 8
- D. < 10
Explanation
A well-adjusted gaseous-fuel furnace aims for only a small excess of air, commonly keeping flue-gas oxygen below about 2%. Higher oxygen levels indicate increasing excess air and greater sensible-heat loss in the exhaust.
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