I just installed a free standing Frontier Box in my garage.....does a great job. Here's my question......with the thermometer on the flue coming out of the woodstove.....it's not a problem to get the flue temp in the non-cresote area as long as there are flames comming off the logs.........but if I have a a good bed of coals in there....the thermometer will drop down into the creasote range.......even though the stove is nice and hot. Does this mean that too much cooler air is flying over the coals from the vent and up the flue before it can be warmed up? Should I close the vents down even more?