The amount of combustible escaping uncon-sumed from the furnace, depends upon the

[A].	air supplied and furnace temperature.
[B].	burner design (thoroughness of mixing versus stratification).
[C].	air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction).
[D].	all (a), (b) and (c).

Answer: Option D

Explanation:

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