Originally Posted by Dr_KY
What sort of temps are you running? With those four holes it must be like an inferno.
They are covered with a metal electrical plate that swivels. I never have more than 1 -1/2 open, so it seems like a waste to me. I run around 230-250 which is where I want to be, but sometime I have to play with it a bit. Plus it doesn't look as cool. It is easier to travel though since there is nothing sticking out from the drum.