I'm going to mount the temperature control system to the drum this weekend, and I have a couple comments and some questions as well. On the horizontal, I use both a fan and a servo controlled damper. Since the drum really doesn't need much help, I'm thinking of going with just a fan. The thermocouple will be constantly feeding data to the PID loop which will in turn tell the fan how much air to blow in order to maintain the proper temperature. No problems there. Questions: 1.) Do you think (1) 1" intake will be sufficient? The fan has quite a bit of power to it, but the diameter of the whole will most likely be the bottleneck. 2.) The Stoker system (and probably the Guru for that matter) uses a flapper to choke the intake when the fan isn't running. I don't really want to deal with that but I'm thinking if I make the intake tube long enough, it should choke it by itself, when the fan isn't running; Correct? I'm basing this on the reports that Bubba noted when he tried to extend his intake and mount the ball valve in a higher location. Any other suggestions/comments?