The air turbulent (in terms of flow properties) when it comes out of the nozzle which gives it a cone like spread. I can simply move the compressor away from the air inlet to lower the air inflow. Additionally, I can simply shift it left or right so some of the air just misses the tuyere.
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Ok, I could see that, I've piddled around a couple blacksmith's forges. They seem to prefer swells in temp to a completely constant flow.