Flue Duct Expansion Joints: Types, Uses & Key Benefits Explained Flue Duct Expansion Joints play a vital role in industrial exhaust systems by absorbing thermal movement, vibration, and pressure changes. This guide from AFS Inc covers rotating, flue gas, and flexible joint types, where each is used, and how they prevent cracks, leaks, and costly downtime. https://www.afsjoints.com/blog/what-are-duct-expansion-joints-types-and-uses