Furnace Technology
Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

All of these
Reduces the flue gas temperature and makes the furnace atmosphere oxidising
Reduces the furnace draught
Increases the load on the induced draft fan

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

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

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