It's just a glow at one end of the line of pellets with the burner off, so it shouldn't raise the temp much if any. If the burner was going, there would be an air draw and they might flame up and burn. If that happens, the temp will spike and the smoke will probably drop to nothing. I wired a foil bag full of pellets to the bottom of a grate and it smoked nicely, but the foil started to burn through. Don't know if it would get hot enough above the grate to char the pellets. I'll try it in a few days when I cook something.