Furnace Technology
Which is not accomplished in an underfired furnace?

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

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Furnace Technology
In a furnace employing forced draught as compared to induced draught,

None of these
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
The fan operates hot and hence blades are liable to corrosion and erosion
Positive pressure exists in the furnace

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