We have changed to a forced air arch with an air tight door and we would like to be able to monitor and adjust the firing process bit more closely. I have reviewed a lot of the posts on monitoring stack temperature on wood fired evaporators and there is good information on temperatures. I would like to get a better idea of where a probe should be mounted on the stack. How important is the location? Woodstoves using dial-type thermometers generally say on the stove pipe, 18" above the stove. So before I starting drilling holes in a new stainless steel stack, it would be good to hear from some other producers. The base of the stack is 3' wide, tapering to a 14" diameter round stack. My plan is to mount the 6" type K thermocouple probe at the point where the round stack meets the base, thinking that this would be the most consistent point to check temperatures. This would be about 3' above the top of the steel plates and rails which support the pans on the top of the arch. Appreciate any comments on this.