Wales915 said:Hmmmm .... Ok .... What I know for sure is, that it has a 3" liner to the top of chimney , but it IS NOT insulated behind the stove at the old damper/ block off, plate was removed, and pipe was just sealed at the cap at the top.. Sealed tight !! I could always install some fireproof insulation around the pipe at the block off this weekend if you think that much is going up the chimney ..
-scott
I'm not there so I don't know how much is going up, but I'd bet far more than you think is going up.
Some of the heat that gets produced exits through the sides and back and in an insert that means if there is any airflow up the flue for any reason up it goes, sealing the top doesn't mean that the airflow in the chimney is no longer happening (sounds weird saying that) but frequently it does. Seals not always being as one thinks they are.
I think it is called trust but verify.