We've put smoke into some tall chimneys, one thing that was discovered was we needed some added airflow for a 16" tall chimney. An 40mm computer fan under the fan driven smoke unit did the trick. If the smoke unit is near the top, it's probably not needed. I used a USA G-gauge smoke unit in a building with two stacks, I just plumbed between the two and split the smoke, that worked well. There was about 6-8" of tubing between the stacks, and one had a straight shot so I could easily add fluid.
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