As I mentioned in another thread I have K type thermocouple on the top of my flu. The flu is insulated and 36' total from top of stove 6' in the basement and 30' in a masonry chimney. The thermocouple is pinntched on the outside of the liner with the band clamp from the top plate. I just calibrated my pyrometer with a fluke multi meter my temp are between 100 and 150F. I plan on probe at 18" and a stove top thermocouples later along with a manometer. This is on an Ashley AF700 furnace but I thought I would post here since the subject came up and this would apply to any wood burning appliance.
![Flu top temps Flu top temps](https://www.hearth.com/talk/data/attachments/290/290170-efb0a3f777fba39a60a908c8d855a513.jpg)
![Flu top temps Flu top temps](https://www.hearth.com/talk/data/attachments/290/290167-1a2309783cba973ecf430f84b44497c9.jpg)
![Flu top temps Flu top temps](https://www.hearth.com/talk/data/attachments/290/290168-72ed659a3528c6a3e7e52dd9b6d06ee1.jpg)
![Flu top temps Flu top temps](https://www.hearth.com/talk/data/attachments/290/290169-4e3db33da190a64503c4807267674d37.jpg)
![Flu top temps Flu top temps](https://www.hearth.com/talk/data/attachments/290/290170-efb0a3f777fba39a60a908c8d855a513.jpg)