Don't over complicate things. The sole purpose of the fan is mearly to circulate air to prevent hot spots in the oven. You can pull the air out and then put it back in again but why do the extra fabrication. Simply place a metal fan in side the oven and run the shatf out through to a motor. If you can set it up so that to shaft in the oven isn't the motor shaft. The shaft will heat up and creap the heat into the motor. Heat + motor = shorter life. Also turn the fan slow, you don't want a tornado test chamber.
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