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

Air supplied and furnace temperature
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
All of these
Burner design (thoroughness of mixing versus stratification)

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Furnace Technology
In a furnace employing forced draught as compared to induced draught,

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
The fan operates hot and hence blades are liable to corrosion and erosion
Positive pressure exists in the furnace
None of these

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