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IMHO it's needed all the time, as long as you want the temperature really 'controlled'. Imagine a bottom fermentic yeast close to the fridge's bottom. It might besome degrees colder than at the top where the thermostat probe is.Why not just wire the fan in so that it switches on and off with your compressor?
If you have the thermostat probe towards the top of the fridge it should in theory be the warmest place inside it. When the compressor cuts in so does the fan. This way it only works when its needed.
In the moment the compressor (and the fan) stops the cold air will fall down to the bottom. But the fridge keeps on cooling for a short period longer than it really runs. So why not let the fan run all the time and let it try to get a homogen tempered enviroment?