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I don't have a book handy, and I'm going off our 2388 with a standard rotor, but setting the rotor at 500rpm, concaves about 3, and the fan 1000-1050rpm is a good place to start. You might need more air if you're getting a lot of fines or weeds in the bin. I don't know about sieves because we never measure them; we have a Petersen airfoil chaffer and it's closed pretty tight. Just mess with it until you get it right. Good luck!
 
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