I have a Klose unit with an offset firebox. I think there is no better unit made today. When controlling oxgen in the smoke, one has the choice of the intake by the firebox, and/or the exhaust on the chimney. I tend to adjust the intake over the exhaust. I like to keep the exhaust fully open whenever possible. I have discovered that if I give emphasis to the exhaust, I get more deposits on the meat I am smoking. I have tested this extensively and measured PPM in the smoking chamber , and have confirmed that I get more particulates when partially closing the exhaust Vs the intake. However, I know this goes against common practice. Any comments?