Abstract: A filter element includes a boot made of nonwoven fabric. A penultimate pleat wall and/or a final pleat wall and/or a final pleat ridge is or are at least partially overlapped by a frame element made of nonwoven fabric. In an embodiment, the frame element overlaps the penultimate pleat wall and the final pleat wall and the final pleat ridge common thereto.

Abstract: In respect of the object of specifying a filter element which can be used as an inertial separator and, while being of compact construction, can be used in small installation spaces, said filter element displaying a low level of flow resistance, the highest possible dust-holding capacity and the best possible separating-off action, a filter element which is configured in the form of an inertial separator, that is to say has means which separate off particles by deflection of a flow medium, is characterized in that the means comprise, or have, nonwoven fabric.

Abstract: A filter medium including a carrier layer and a microfiber layer applied thereon is characterized in that, with respect to the aim of providing a filter medium which has a relatively low pressure drop, and at the same time a good fraction separation rate and excellent dust storage capacity, the carrier layer has first fibers, which are designed as endless bicomponent fibers and spunbonded fibers, and the microfiber layer has second fibers, which are designed as endless melt-blown fibers.

Abstract: A filter medium comprising a carrier layer (1) and a microfiber layer (2) applied thereon is characterized in that, with respect to the aim of providing a filter medium which has a relatively low pressure drop, and at the same time a good fraction separation rate and excellent dust storage capacity, the carrier layer (1) has first fibers, which are designed as endless bicomponent fibers and spunbonded fibers, and the microfiber layer (2) has second fibers, which are designed as endless melt-blown fibers.