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

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

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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
None of these
Positive pressure exists in the furnace
The fan operates hot and hence blades are liable to corrosion and erosion

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