Dave,
I roast inside my garage were I have placed a window fan (2 small fan) directed to exhaust the air out. (Fan direction can be change, in/out)
With the Beemer, I just place the beemer in front of the fan direct to take the air out and then a short time after the cooling cycle starts, I change it to blow the cool air inside so that the beemer can cool faster while in cycle mode.
With the UFO/TO ??.I only direct the air to go out and sometimes I also do place the chaff pipe out the window thru a cardboard hole I?ve cut out and also placed in the window.
One of the main ways that I know were I am in a roast is by smell so the smoke is very important to me. The fan trick is very useful in this way without smoking up my garage.
My garage doesn?t smoke up with the fan taking the air out. But my neighbors always now when I?m roasting coffee.
I hope this answer your question senor.
Enjoy
Michael