Well I decided to do the mailbox mod on my smoker today. I got me a mailbox and some semi rigid ducting and a couple fittings for the ducting to the mailbox and smoker. I drilled a hole in the back of the mailbox put a fitting in attached the ducting then ran it to the smoker. I drilled a couple 1/2 inch holes in the mailbox door for airflow. Well that was super easy and took like half an hour and I was happy. I decided to fit up my AMNPS and see how it worked. Well I or it lit and let it burn for ten minutes blew it out and set it in the mailbox. Well it was going great making a lot of smoke so I decided to go take a nap and check on it later. When o woke up the pellets had gone out and I can't figure out why. It burned all the way down to the end of the first row then went out. And the other side never really took off. It just fizzled out soon after going on the mailbox. Now I know it obviously wasn't getting enough air once it got down to the end of the first row. I also know this is a long explanation for a simple questions. Well I want to know should I drill more holes in the door or would it make more sense to drill holes in the middle of the mailbox by where the end of the first row is located?