I've been checking out some of the builds on here for a few weeks, since I decided to convert my old proapne tank into a smoker. I think it is 120 :Lb with an old 25 gal drum on the side. I don't have the exhaust vents in it yet like I would like so I'm just using all the ports at the top. Eventually I would like an exhaust close to the fire box and one at the other end. My problem is I ran a test chicken through it last night and the temp is about 200 in the top and 150 in the mid and even lower in the bottom. I think I might have cut the firebox opening too high. its almost smack dab in the middle of the side of the tank and about a 10 x 10 opening. I'm going to try and post a picture of the half completed job. everything has been free so far so thats why I chose the drum on the side. Any help would be appreciated. sorry the image is a little dark where the firebox is at.