Does Your Lined Flue Still Get Warm??

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liner insulation is only 1/4" to 1/2" thick and temps inside are several hundred degrees. It will be warm.
 
Mine does as well. I remember making a post about it when I first started burning. Once I got thinking about it, I decided that even just putting the liner in there, I was still burning safer than a lot of people out there!
 
After about 4 hours my cinderblock gets warm to the touch - not too hot.
You can rest your hand on the surface without discomfort - less than 120 degrees
I would say.....
 
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