Colin.
If the turret fan is mounted in the upper front left area, odds are is would be blowing air to the right side, across the guns.
Is it possible the intent was to direct the gun fumes towards that side of the vehicle because of the presence of the large, long external shroud locate on the right side of the vehicle? Perhaps, with the vehicle in motion, airflow passing that shroud drew air out of the interior of the tank in some way, and the fan helped the process along. That shroud assembly might be multifunctional.
David
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