Hi! Replacing old wood stove insert with new one. The new one needs a chimney pipe of 180mm, the existing galvanized pipe is 200mm. The manufacturer explicitly specifies 180mm, 200mm they consider too wide. You can use 150mm, but then your chimney needs to be 6 meters+, with 180mm 5 meters is sufficient, and I have that.
My idea is to insert a new 180mm pipe into the existing 200mm tube. The available material options are (too) plenty. There is galvanized iron, there is vitrified black pipe material, there is inox. All these are available as single-walled pipe material, but also double-walled. Then there are flexible (inox) liners, but a bit unsure if they survive sweeping.
The stove specs say flue gas temperature is 200°C/392°F; as I already have an existing metal channel, what sort of material would you recommend?
I like inox, but I have no idea if it is better for chimneys than other materials.
Double-walled could be overkill, as there already is an existing channel.
(Would you use spacers to nicely center the new pipe into the old one? )
![[Hearth.com] Chimney pipe material advice?](https://www.hearth.com/talk/data/attachments/341/341226-6086adcc3c90adebaecf5d75d2f4544e.jpg?hash=ebMOrRwimT "[Hearth.com] Chimney pipe material advice?")
My idea is to insert a new 180mm pipe into the existing 200mm tube. The available material options are (too) plenty. There is galvanized iron, there is vitrified black pipe material, there is inox. All these are available as single-walled pipe material, but also double-walled. Then there are flexible (inox) liners, but a bit unsure if they survive sweeping.
The stove specs say flue gas temperature is 200°C/392°F; as I already have an existing metal channel, what sort of material would you recommend?
I like inox, but I have no idea if it is better for chimneys than other materials.
Double-walled could be overkill, as there already is an existing channel.
(Would you use spacers to nicely center the new pipe into the old one? )
