Would adding this to my exposed chimney pipe improve my stoves efficiency?

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rashomon

Member
Jan 14, 2018
73
Denver, CO
My chimney is exposed (no chase). Looking at my invoice I believe it's a DuraVent 6DT (double walled) exterior Class A chimney.

It's warm to the touch when my stove is going. I use a FlueGuard thermometer probe to make sure I'm keeping my stove's exit gas temps within the ideal range.

Without a chase on a windy and cold day I imagine a lot of heat is pulled away from the chimney. I find myself needing to keep my air intake high to keep my exit gases in the good zone.

If I enclose my chimney in an additional pipe, like this, would that help? The diameter of this is only 0.8" larger than my chimney. I was thinking about wrapping some thin insulation around the chimney to act as a spacer (maybe something intended for hot water pipes?). Or maybe 3 dowels made of high temperature material running vertically -- this is just to provide even spacing and make sure one wall isn't touching the chimney. What do you think?

I guess if I'm worried about it being airtight I can just leave the top open, otherwise I could make small - 1/4" - cuts in the top and bend it inwards.
 
your Class A is already insulated.
Don't bother with the additional pipe; it's meant to run as it is. They use them in Canada too...