External twin wall flue
You have the option to extend the twin-wall insulated flue pipe through an exterior wall and along the outer surface of your house.
The connection to the appliance or to single wall vitreous parts has to be made through an adapter.
You have the option to extend the twin-wall insulated flue pipe through an exterior wall and along the outer surface of your house. External flue setups tend to be somewhat pricier than internal ones, given that they typically include a minimum of one 45-degree bend and a 135-degree Tee, often accompanied by two additional bends to navigate around any protruding structures.
As standard, twin wall flue will, to comply with Building Regulations, protrude approx. 45cm into the room where the stove is (even on a silver flue this protruding section will usually be black unless otherwise specified). The flue below this will usually be single skin black vitreous steel pipe.
The internal stove pipe will usually travel vertically 50cm before changing to 45 degrees and passing through the wall to outside.
Twin wall flue requires NO sealants or pastes or glues. It is "clip together".