Fabric Expansion Joints are installed in ducts carrying dry gases at maximum
35 kPa pressure. Most importantly, they are extremely flexible and can be made from layers of a variety of special fabrics coated or laminated with elastomers or fluoropolymers.

Due to flexibility, they can absorb movements simultaneously in several directions and they have almost no reactive forces. The major design parameters are the temperatures and flow rates of the gases and the amount and abrasiveness of solids suspended in the gases.

Layers of different fabrics insulation can be combined to accommodate the temperatures and pressure in the system. The fabric belt may need to be replaced periodically.