Presence of pulsating pressure – Fabric Expansion Joint

The presence of pulsating pressure in the ducts submits the multilayer fabric expansion joint to continuous positive and negative stress, causing mechanical stresses to the fibres in the flanging area.

This way, a fabric expansion joint is destined to break prematurely.

The installation of a protective Isolmat bolster bag internal to the expansion joint, thanks to its own volume prevents harmful oscillations caused by pulsating pressure.