Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

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Ram Sharma

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📊 Furnace Technology

Q. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

(A) < 2
(B) < 5
(C) < 8
(D) < 10

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✅ Correct Answer: (A) < 2

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