The increase in the breach opening along the axis of the duct. In certain configurations, the duct thermal expansion may result in extension at the expansion joint location.
![Fabric Expansion Joint Axial Extension](https://usbellows.com/wp-content/uploads/2019/03/axial-extension.jpg)
The increase in the breach opening along the axis of the duct. In certain configurations, the duct thermal expansion may result in extension at the expansion joint location.