What temperature should a single wall stove pipe be reading 18" above the stove? I'm burning a Jotul Oslo. My pipe goes up about 30" to a 90 degree bend through the wall and dumps into a masonry chimney which goes up from there another 8' What is the maximum temp a single wall stove pipe should get too in my situation and for how long? I usually get the pipe to 500 - 550 upon initial start up and close down the air to run the stove top temperature around 450. I would like to run the stove top temp to 600 as Jotul says the best range is 400-600. **All temp readings are the surface temperatures.