Hi, figured you guys would be the ones to ask as I don't yet own a gas smoker, just charcoal but looking to upgrade here shortly. Anyway my question is this: All the vertical gas smokers I see are the rectangular type, with vents at the top. In looking at the threads on the side fire charcoal smokers, most of those have vents at the top also, but the dryer duct mod is common on those, which forces the smoke and heat to stay in the chamber longer before exiting the dryer duct at grate level. Why isn't this the case with the vertical gas smokers? They all have the vents at the very top.. wouldn't the smoke and heat go right on up and out of the thing? The reason I ask is I saw the king kooker vert gas smoker online, and it has the top vent on the backside of the smoker, about 1 or 2 " from the top edge. While this is still pretty high, wouldn't the smokers do better with the vent placed a little lower, keeping the heat and smoke circulating inside from escaping a little longer? I would assume that this would also help keep temps up/stable (assuming the smoker didn't leak like a sieve) Am I missing something here? can some of you guys chime in and tell me what you think? or am I way off base here and do you think a dryer duct type mod would be beneficial for a top vent vertical smoker? (maybe down 6 or 7"? anyone ever done any experimenting?