A 150mm black twin wall 90-degree tee for a twin wall flue is a component used to connect a flue pipe horizontally to a vertical flue at a 90-degree angle, often for exiting a wood stove or appliance through a wall or at the base of a flue for cleaning.
Twin-wall flues are designed with two layers of stainless steel, providing insulation between the flue gases and the surrounding environment. This design helps prevent condensation and ensures proper flue performance, even in condensing applications.