8" to 6" flue reducer for 91 Buck

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The insert is large, it requires an 8" liner unless Buck explicitly says it can be connected to the 6" liner.
 
From what i have seen they have a tendency to over heat if run on a 6" liner. Cant say it will happen with yours but i have seen a few that it has happened to. And it destroyed 2 of them
 
I have a Buck 94 which is the 91 with burn tubes instead of a catalyst. According to the Buck website, both need an 8" flue.
 
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