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|Following a summary of aerodynamic principles and the changes imposed by the process, areas important to the operator are then enumerated. These include furnace lines, cooling and casting technology, coke properties, gas distribution and others. Questions are raised on the implication of lowering the hearth substantially below the tuyeres and about the status of stack injection. Finally, the future developments are identified as being those associated with gas volumes required to pass through the furnace stack per unit time or per tonne of product.|