Furnace Technology
Low stack loss indicates the

Inefficient use of fuel
Efficient use of fuel
Use of sub-stoichiometric air for combustion
Oxygen enrichment of combustion air

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

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
All of these
Burner design (thoroughness of mixing versus stratification)

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