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

Positive pressure exists in the furnace
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
None of these

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Furnace Technology
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Thermal conductivity of the charge & structural materials of furnace
All of these
Nature of process ; whether batch, continuous or intermittant
Rate of firing and emissivity of flame

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