I was having problems before with my MES analog and amnps making a very acrid smoke, and came to the conclusion that it was poor airflow causing my problems. So I spent the last 2 days cutting up my smoker and making the mailbox mod. I don't have pictures at the moment but the smoker is up high with mailbox below and 3" tube coming into the side of the smoker and added 3" elbow on top of smoker for exhaust. I am getting no smoke even remotely close to thin or blue and still had a very acrid smell. Just doesn't smell anything like burning chips. I'm afraid to ruin anything else in this smoker. What am I missing??? Its driving me absolutely nuts!