Its a newer model with the vent and latch. However, I tried it for the first time and am having mixed results. There is the lip and then the tray portion of the chip holder. I may have doublestacked the lip over the element the first time when I cooked a chicken at 230 degrees. I tried it with the lip under the element and the tray above it and had it at 130 degrees with no smoke at all. I cranked it up to 180 and got plenty of smoke. Where should I expect smoke to start? Also reading the forum, it seems Masterbuilt recommends too much wood which after using it for only a day I can see why. I had filled the tray even with wood as per instructions, and it was way too much. Thanks for any tips.