I just started my very first smoke... ever. On my new MES 30 digital. (feeling a little nervous about the whole thing) I figured I'd jump in to the deep in - I have a rack of ABTs, a rack of veggies to make JJs Au Jus, and a 2# tri tip. The whole thing has been going for about 15 minutes, nice smoke coming out of the vent... I just realized that after my several days of research here, I don't know if the vent is supposed to be all the way open... closed... half way... ??? Any help? also... I'm going at 225 degrees, and I'm figuring on about 2.5 to 3 hours.... does that sound right?