Originally Posted by Mark
PS: The reason is you'll get an instant flare-up once the excess air hit the fire (like when you lift the lid off).
I actually had a flashback of sorts in mine this weekend...cooking pork loin @ 350*. Nothing major, but the trashcan did fill with a blueish/orange swirl all the way to the top. I added fresh lump over red coals, so I thinkin' that was the difference maker...pretty cool lookin' if nothing else.