Well I had the day off today and my local TrueValue had a ton of DuraVent pipe (surprisingly). I have a 3" up and over to my hearth where the previous homeowner has a 6" hole for their woodstove. There is roughly 19" from the inside hole to the outside hole in the chimney.
What can I do to fill the gap between where the pipe from the stove goes in the hearth and meets the chimney liner? There is a ton of cold air that comes through that hole when I pull the 6" stove pipe out and I can't imagine a thimble would insulate that well. Can insulation be used? I doubt it, but I'm throwing stones here. Or is there some sort of reducer they make for this?
Here are a few pics to semi-illustrate.
Click for bigger size
Just a basic pic of the hole.
![6" Hole in hearth. What do I need to fill the gap for 3" DuraVent? 6" Hole in hearth. What do I need to fill the gap for 3" DuraVent?](https://www.hearth.com/talk/attachments/th_picture001-jpg.179947/)
This is the depth from the opening in the chimney to the inside
![6" Hole in hearth. What do I need to fill the gap for 3" DuraVent? 6" Hole in hearth. What do I need to fill the gap for 3" DuraVent?](https://www.hearth.com/talk/attachments/th_picture002-1-jpg.179948/)
What can I do to fill the gap between where the pipe from the stove goes in the hearth and meets the chimney liner? There is a ton of cold air that comes through that hole when I pull the 6" stove pipe out and I can't imagine a thimble would insulate that well. Can insulation be used? I doubt it, but I'm throwing stones here. Or is there some sort of reducer they make for this?
Here are a few pics to semi-illustrate.
Click for bigger size
Just a basic pic of the hole.
This is the depth from the opening in the chimney to the inside