Yesterday I decided to attempt the mailbox mod for my smoker. I use a pellet tube and when it is placed inside the smoker, it tends to be a pain for the reason that I believe the burner consumes the oxygen and thus keeps the pellets from really smoking. So I did the research and decided on the mailbox mod. This morning I was going to smoke two butts and time for the mailbox mod to shine. Well after a few hours of more smoke coming out the front air holes on the mailbox, I have abandoned the mail box and stuck the pellet tube inside again. I have no clue why I wasn't getting any smoke to come thru the smoker. Chimney was even wide open for air flow. Yes I nuke the pellets to get rid of extra moisture. I didn't cut a new hole in the side of the smoker. I just opened the one vent and connected the mailbox and piping to the one side of the open hole. Used HVAC tape to connect and seemed to hold real well. I did notice that when I opened the bottom door of the smoker, all of a sudden I could see smoke coming in but nothing thru the chimney when the door was closed. So what the heck is going on? Disappointed.