Filter element

In a filter element intended to operate at high, pulsating pressure and including a hose-like filter means made of fibrous material, an inlet to the interior for supplying contaminated air and a wall through which purified air departs, the filter means surrounded by a net-like, elastic hose-like member, the improvement comprising;

• the length of the filter means and the circumference of said means in the expanded state of said means exceed the length and circumference of the net-like hose-like member, a corrugated wall interposed between said filter member and said hose-like member, the filter means arranged in folds abutting the corrugated wall, said corrugations extending in the longitudinal direction of the filter means, and said filter means held compressed by said hose-like member.