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I have recently installed a Diedrich ir-3tt in my new roastery. I have installed approx. 6-7 meters of ducting, maybe I would need a fan to back up the airflow. My first roast went along very well, I had good control on the roast and the airflow seemed to function in a similar way as my electric Diedrich. But when I cool the beans it takes over 10 minutes before the coffee hit room temperature. I therefore conclude that the long ducting is the reason for my long cooling times due to bad airflow. To test this I do a similar batch with only 1 meter ducting to see how this influence the cooling time. After dropping the coffee the cooling of the beans still takes 10 minutes:-0 I feel that it goes smooth roasting on it, but the problems is when cooling. I dont get tipping, and the airflow removes a lot of the chaff, although it is some chaff under the cooling bin. When removing the cooling bin, I see five holes with approx. 5 cm diameter. This holes are in the bottom of the roaster, right underneath the cooling bin. When checking I notice that these holes are sucking air, a piece of paper is dragged right in when put underneath the roaster. I simply dont understand why these holes are there, but it seems to me that the air will find the easiest way in to the roaster - but at the same time it kills my cooling-times. If anyone on this forum has a Diedrich tabletop roaster, could you please check if these holes are there - for me it seem logical to cover this holes so the air can be forced through my beans instead. I added a photo of the holes. I would appreciate comments on this matter:-)