Re: A thought about fans...
carwiz is correct in stating most fans are mounted on the outside to remove the fan motor from the oven temperatures. The Dayton fans like the one I use have an external cooling blade that helps cool the motor shaft. I'm not sure actual placement of the motor is important although moving it away for the inlet air source may slightly reduce motor temperatures.
Rather than placing the discharge in one of the lower corners, you might consider placing it in the bottom middle and using a diffuser to distribute the air.
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