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Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.

Question: Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
[A].

5

[B].

10

[C].

20

[D].

35

Answer: Option C

Explanation:

No answer description available for this question.