Twin Wall Insulated Lining
Prefabricated Twin Wall Flue Systems
Introduction to Twin Wall Flue System
So, no chimney in the room where you want your stove? Why not create one?
Twin wall flue is also known as DW (double wall) or HT (High Temperature) flue.
Twin wall flue is a metal tube (flue) insulated with approx. an inch of insulation (two layers of stainless steel with insulation between). The insulation is necessary to keep the gases hot. Were you to use non-insulated flue pipe for the whole of your chimney, then the gases would likely cool too much and start to slow rather than rise with this causing the smoke underneath to “dam”. This might cause the smoke below to exit out of the vents in your stove instead of the top of your chimney.
Cooling gases also form condensation which forms on the inner walls of the flue and runs down into the stove (mixed with soot it is a disgusting brown liquid).