Depends on the smoker I guess, but with a digital MES 30 or MES 40, I leave the top vent open fully all the time, and my AMNPS chugs along all the time, and I never get any bad tasting smoke flavor.
I'm still pretty new but I thought the draft was supposed to be fully opened all the time. Elsewhere I read that holding the smoke back will cause an unfavorable flavor. Comments please.
With the AMPS You'll need to start out leaving the vent full open, after it you get more familiar you'll probably want to shut the vent back to 1/2 way after the unit has drawn a draft.
If you are using chips, you'll want the box heater on to ignite the chips, and then regulate the vent to keep as much smoke as long as possible. If you leave it shut the limited amount of air will smolder out the chips, then the heater will ignite them, etc till ya run of chips.
I won't go into sweet spots, but with the AMPS just leave it open to start. The AMPS will burn fast but its just pellets.
Bear is right, with the AMPs full open. After awhile when you get more comfortable with the unit then you might try regulating the vent and see what you think. But full open will guarantee a full draft.
I'm still pretty new but I thought the draft was supposed to be fully opened all the time. Elsewhere I read that holding the smoke back will cause an unfavorable flavor. Comments please.