Furnace Technology
Fuel economy in furnaces can be achieved by

Using oxygen enriched combustion air
Preheating the combustion air
All of these
Reducing the heat loss through furnace openings & doors

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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)
Burner design (thoroughness of mixing versus stratification)
Air supplied and furnace temperature
All of these

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