A 200mm black twin wall 30 degree elbow is a component used in twin wall flue systems, specifically designed to change the direction of the flue pipe by 30 degrees. It's used to create an offset or bend in the flue, allowing for adjustments in the flue's path, such as navigating around obstacles or changing direction.
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.