Abstract: A filter cartridge for a filter apparatus, including: a filter element that encloses an clean space within the filter element, at least partially; wherein the filter element has an outflow opening in flow communication with the clean space in the filter element; wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening; wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space; wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner.

Abstract: A filter insert for a filter device, having a filter element arranged on a longitudinal axis extending there through and a front-side flow opening arranged on the front side of the filter element with the longitudinal axis extending through the flow opening. The filter element has, with respect to the longitudinal axis, at least one flattened portion with a reduced radial extension or a through hole along the periphery of the flow opening the shortest interior distance in the filter element immediately adjacent to the front-side flow opening is shorter than the inside diameter of the front-side flow opening.

Abstract: A filter element is provided with at least one filter medium body and a flow chamber that is at least partially enclosed by the at least one filter medium body. A distribution element is provided that distributes a flushing gas to be introduced into the flow chamber. A carrier body that forms a wall element of the wall delimiting the flow chamber is provided. The distribution element is fastened to the carrier body. A filter device is provided with a filter housing that accommodates the filter element and is further provided with a flushing gas device.

Abstract: A humidifier has a stack unit having a plurality of water-vapor-permeable membranes which are arranged parallel one above the other and spaced apart from one another. The membranes are enclosed at the edges at least in sections by an enclosing part, wherein the enclosing parts of membranes lying one above the other are directly connected to one another in a flow-tight manner.

Abstract: A humidifier has a stack unit having a plurality of water-vapor-permeable membranes which are arranged parallel one above the other and spaced apart from one another. Two adjacent membranes are connected to one another via fixing elements, wherein a first fixing element acts on the top membrane from above and a second fixing element acts on the bottom membrane from below.

Abstract: A filter assembly for a fluid to be filtered, in particular fuel or oil, has a filter housing having a housing lower part that is configured as a single piece and has at least one fluid inlet for the fluid to be filtered and a plurality of filter pots that are arranged next to one another side by side in a shared plane and are fluidically connected to one another via side wall passages An upper housing part closes the filter pots and has a fluid manifold that has at least one fluid outlet for the filtered fluid flowing out from the filter pots. At least two filter elements, one being arranged in each of the filter pots of the filter housing. The filter assembly is a more inexpensively-manufactured and as configured for installation even in confined installation spaces, so as to accommodate a sufficiently large filter surface for a predetermined volume flow of a fluid to be filtered.

Abstract: The invention relates to a filter unit, a filter system (44b) with at least two filter units, and to a motor vehicle with a filter system (44b). A filter bowl (12d-e) of the filter unit is formed by a base and a cover. Embodied in a side wall of the base are at least two access openings to an antechamber or collection chamber (34a-b) in the filter bowl (12d-e). Embodied integrally with the cover is a collection line segment or supply segment (26d-e) that leads from a clean chamber or an unfiltered side antechamber in the filter bowl (12d-e) to at least two open ends (28l). The inventive filter system (44b) has at least two inventive filter units, and fluid may flow through their filter elements (30, 30a-d), which are switched in parallel. The invention facilitates the space-saving arrangement of filter units and filter systems (44b) in constricted and/or complexly shaped installation spaces, especially in motor vehicles.

Abstract: Disclosed are an air filter element, a filter housing, and an air filter in which the air filter elements have a high filtering capacity and a long service life by increasing the filter surface of an air filter element taking into account structural requirements for the air filter housing.

Abstract: A filter device comprises a filter element that is comprised of at least two radially nested filter bellows, wherein at least one filter bellows is to be flown through in the radial direction and a flow space for the fluid is formed between the filter bellows. Each filter bellows is embodied as a star-shaped filter with filter folds arranged in a star shape. On at least one end face of the filter element a sealing ring is arranged between a filter bellows and the filter housing.

Abstract: A filter cartridge for a filter apparatus, including: a filter element that encloses an clean space within the filter element, at least partially; wherein the filter element has an outflow opening in flow communication with the clean space in the filter element; wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening; wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space; wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner.

Abstract: A filter insert for a filter device, having a filter element arranged on a longitudinal axis extending there through and a front-side flow opening arranged on the front side of the filter element with the longitudinal axis extending through the flow opening. The filter element has, with respect to the longitudinal axis, at least one flattened portion with a reduced radial extension or a through hole along the periphery of the flow opening the shortest interior distance in the filter element immediately adjacent to the front-side flow opening is shorter than the inside diameter of the front-side flow opening.

Abstract: Disclosed are an air filter element, a filter housing, and an air filter in which the air filter elements have a high filtering capacity and a long service life by increasing the filter surface of an air filter element taking into account structural requirements for the air filter housing.

Abstract: A humidifier has a stack unit having a plurality of water-vapor-permeable membranes which are arranged parallel one above the other and spaced apart from one another. The membranes are enclosed at the edges at least in sections by an enclosing part, wherein the enclosing parts of membranes lying one above the other are directly connected to one another in a flow-tight manner.

Abstract: A humidifier has a stack unit having a plurality of water-vapor-permeable membranes which are arranged parallel one above the other and spaced apart from one another. Two adjacent membranes are connected to one another via fixing elements, wherein a first fixing element acts on the top membrane from above and a second fixing element acts on the bottom membrane from below.

Abstract: A filter element (1) for an air filter (30) has a tubular filter medium (2), the annular cross-section of which encloses an interior (6) of the filter element and which has an inner wall (7) that adjoins the interior of the filter element and that extends in the form of at least one convex arch (8) and at least two concave arches (9), the concave arch (9) being located between two convex arches (8) such that the interior (6) of the filter element has a constriction (11) in the area of the concave arch (9), the constriction (11) being adjoined by two wide zones (12) of the interior of the filter element.

Abstract: A filter insert has a filter element with an end surface at an inlet side and an end surface at an outlet side that are spaced from one another in a main flow direction of the filter insert. A frame circumferentially extends about lateral sides of the filter element. An axial seal is supported on the frame and has a sealing direction in or opposite to the main flow direction. When inserted into a filter housing and contacting a sealing surface of the filter housing, the seal separates seal-tightly the inlet and outlet. The frame has on two opposite lateral sides of the filter element contact surfaces for clamping the filter insert by matching clamping elements. The contact surfaces are oriented opposite to the sealing direction and each have an individual profile of varying height extending along the two opposite lateral sides.

Abstract: A filter device comprises a filter element in a filter housing, wherein the filter housing is to be closed by a cover element. A friction section of the cover element, in an intermediate position between closed and open positions, is in friction contact with a friction member while in the closed position of the cover element the friction section is without friction contact with the friction member.

Abstract: Disclosed are an air filter element, a filter housing, and an air filter in which the air filter elements have a high filtering capacity and a long service life by increasing the filter surface of an air filter element taking into account structural requirements for the air filter housing.