We have removed an old wood stove and now need to brick up the opening in the chimney. Any tips on how to do it properly? Anything specific to keep in mind?

Old stove opening in chimney with some bricks and debris around, insulation material, a white stool, an orange toolbox, and wooden plank on the floor.
 
"Think about"
That it should be possible to open and use again.
Not impossible that we suddenly face a global electricity shortage, then it is very good to have a murstock to bring out.
 
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Vardagsrum
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Claes Sörmland
Cut away stos, mortar, and stones until you have an even hole.

Clean up and carry out all debris. Sweep and vacuum the surfaces. Remove soot from the surfaces with a wire brush and vacuum.

Buy some solid bricks in red brick and a brick hammer. Cut the bricks to the right size for the hole.

Wet the bricks and those around the hole. Seal with any mortar of your choice and make sure to fill the joints completely. I would choose lime mortar, e.g., 3 parts masonry sand and 1 part lime paste that you've mixed a few days before from Murkalk E and stored under a lid. C-mortar works too, but it's harder to get it looking nice and it's a hassle for the next owner who wants to install a stove again.

Plaster the chimney twice with lime mortar.
 
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PNO and 1 other
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Claes Sörmland Claes Sörmland said:
Chisel away the flue, mortar, and stones until you have an even hole.

Clean everything out and remove all the debris. Sweep and vacuum the surfaces. Remove soot from the surfaces with a wire brush and vacuum.

Buy some solid red bricks and a masonry hammer. Chisel the bricks to the right size for the hole.

Wet the bricks and those around the hole. Secure with any mortar of your choice and make sure to fill the joints completely. I would choose lime mortar, e.g., 3 parts building sand and 1 part lime putty that you've mixed a few days before from Murkalk E and stored under a lid. C-mortar also works but is harder to make look nice, and it will be a hassle for the next owner who wants to install a stove again.

Plaster the chimney stack twice with lime mortar.
thanks! Exactly the type of response I was hoping for. I was a bit unsure about how many layers were needed as well.
 
However, is the channel used for anything else? If no flue gases pass through, there's no need to exaggerate.
 
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Staffans2000
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