Great info here for sure. I have an older Nb Bandera Vertical off set smoker. I just built a charcoal basket (16"x12"x4") from 3/4" 9 ga expanded metal. I have noticed that I burn much hotter now. So I want to seal up the fire box top lid and rear door. Also the sliding vent on the door is not really the best in sealing. Any ideas on what would work best in my case? I use the Minion method with a full basket, dig a hole in the center and add 15 - 20 fully hot Kingsford coals in the hole. Thanks in advance.