Insulation?

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Dann-0

Member
Jul 4, 2020
7
New Hampshire
I’ve recently installed a resolute in my fireplace. The stainless pipe goes right up and out. The stove sits in the fireplace pretty deep. I feel the heat is going up the flue cavity. What can I use to block it off?
 

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A metal block off plate screwed in place with a bead of silicone and rockwool on top.