actually this is take four.
- exit hole on top. Mistake. lots of uncombusted smoke
- exit hole on bottom. Better, but still lots of smoke
- pipe extention to inject smoke into the heart of fire. That worked, but the ducting I was using still leaked smoke.
- today’s experiment
Somehow, the thought of using an old paint can came to mind. I looked at my collection of paint and I found two that were bad. I took the old primer can with thick yogurt consistency. Plus there was only 1.5″ left.
I cleaned it out and drilled a 1/2″ hole in the bottom for the pipe. Notice the elbow to reduce the chance of stuff getting in there. Also the small hardware cloth cage to ensure a clear path to the pipe. The outside of the can is a 3/4″ wash with threads cut into it using the pipe thread cutter I got from Harbor Freight.
Here, you can kinda see the pipe extending down into the fire.
The first batch had some smoke, but I suspected that’s the coating on the can burning off. 
The results are pretty good, though not very much of it. Need to find a larger paint can. Somehow I remember the existence of 2.5 gallon containers.
