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Scott, I agree on all of those items. I would guess that new air is introduced at the top of the heating chamber #3. It could be a pressure sensitive valve, or simply a fixed orifice to introduce a certain amount.

I could not locate the roasted bean output either. Surely it has to come out above the counter or in a bagging niche directly below it. Yesterday I went looking for it in the video and in other images but could not find any outlet.

What we don't know is how well it roasts coffee. It is a well made hot-air roaster. A lot will depend on the algorithms in the controller. What we do know is that both the lofting air temperature and pressure are controlled.