Here's how the clean and dirty smoke combo works. This is when you want a heavier smoke flavor
See those two thingamajigs? That's where the smoke gets into the cookbox. I pulled the bottom one out fully. Top one is closed, that's all clean smoke
Notice how the flame is shooting up, that's any smoke going into the cooking box is passing through the hot bed of coals.
Under the firebox is where the inverted flame shows
Now, here I got both thingamajigs pulled out. That's the clean and dirty smoke combo
Look at the flame shooting into the lnlet, getting pulled into the cookbox. You'll also notice that there's no bellowing smoke even though it is called "dirty smoke"
Now that's fire management.