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Here is my bean cup-I opened up the fins with a screwdriver to increase flow. A little too much, I started to lose beans through the fins, had to close them up. Had no idea you could get that much air out of that small of a fan. Some made it into the chaff collector. Note the thermometer probe. I pull it out half way when roasting, otherwise beans collect and burn in the triangle it makes against the side of the cup.