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

Air supplied and furnace temperature
All of these
Burner design (thoroughness of mixing versus stratification)
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
Which is not accomplished in an underfired furnace?

Portection of the periphery of the charge from excessive radiation
Elimination of cold spot at the bottom of the charge
Reduction in the temperature of furnace gases
Increase in heating capacity/m² of floor space

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