My roast profiles on this unit runs about 10 to 11 min to 1st c total roast time15 min.
I hear what is said about the heat but I?m not really noticing any mayor heat loss.
I ?m ok with this roasts profile and I would say that my taste buds are ok with it too.
The tubing works really good as it was posted before that it helps the TO from not sliding and it does IMHO a great job of sealing in heat. Especially when the tubing expands.
Some clearing up.
You can?t really see from this photo but the inside hole that is cut for the air & chaff to blow out thru to the pipe is not as big as it seems, about the size of a nickel.
I also inserted at the end of the exhaust pipe a drain stopper cap "thing" (Home D), that fits very nicely I may say. This is also the main reason for why I used this size of pipe. It helps more with collecting/controlling the chaff to stay in without letting to much heat out.
In all fairness & to clear things up I would have to add that the pipe is used to contain the chaff as a chaff collection device and not really as a smoke exhaust chimney.
It does look cool I do have to add, especially when I turn on the remote head lights in front of the roaster.
& roast at night
Michael
Photos of the chaff pipe collection thing.