No rules.Set it where you want and experiment.Try half throttle on a butt or low setting on a wrapped brisket.The possibilities are endless.A friend of mine did a butt on one and it was great for roasted pork.No smoke flavor but still tender juicy roasted pork.It made for killer Cuban sandwiches.Even if you get the temp too high on a butt cook,worst case scenario is you will have a " crusty butt"! Sorry,I could not help it.