Remove insert pipe in chimney

[Bnicke]

The previous owner installed a liner in the brick chimney of the house, in the flue used for an oil boiler.

I have switched the heating system to geothermal heat and would like to remove the liner to get maximum area in the flue so it can be used for a kitchen fan or stove.

Does anyone know how these liners are usually attached? Can I remove it with a bit of force and pull it out, or is it glued and permanently fixed?

If possible, I plan to repair/improve the flue with slip casting afterward.

 

[Lymmeln]

Usually, they are only fixed at the top and bottom, then it is likely to be filled with insulation between the chimney channel and the pipe, such as värmeculit (like styrofoam balls).

However, I can recommend letting the pipe stay and using it if you connect it to a kitchen fan for all the moisture that needs to be expelled.

 

[Bnicke]

The pipe is quite narrow, about 110mm, which I think is too small (?) for a kitchen fan. But otherwise, it appeals to me, as it would require less work.

However, you have to create a duct in the middle of the insert pipe in the chimney, which seems somewhat tricky to make a good hole in the stainless steel pipe.

 

[Lymmeln]

I have a feeling that it also depends a bit on the length if it's too narrow, but a kitchen fan usually has a diameter of 160mm, and supposedly, your chimney pipe is 120mm outside.

You can knock a hole in the chimney flue where you want the pipe to go out, loosen the pipe at the top and bottom, pull up the pipe a bit, cut the pipe in the hole, and pull it out through the knocked-out hole and tidy it up on top.