I use a Guru for long cooks on my BGE. Best to put it on after the fire is established but at least 50° before target temp. Be sure to close the slide 2/3 - 3/4 the way or the Egg will pull enough air to keep the temp. rising even though the fan is not running. When using a controller, it should provide all the air. I generally don't use mine if I plan to be around the deck area but will use it if I have to run errands (or nap) while smoking.
Almost forgot... Close the "daisy wheel" until the vents are open only a sliver... The Guru will force the smoke out and keeping them nearly closed minimizes "drafting".
Last edited by shirknwrk; 03-15-2013 at 10:31 AM..