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The default fan speed for the unit is 14,700 RPM and the input is multiplied by 10. Inputting a value of 25 will raise the fran fan profile by 250 RPM. A good starting point is inputting a value of 10 (100 RPM) and going from there.
Each coffee is unique and you may need to spend some time dialing this value in to achieve the perfect roast for that particular coffee.
When roasting on BOOST at lower sized batches we find that sometimes the auto adjusted fan speed might still be too high with some coffees so lowering can resolve this issue.