According to the present disclosure, air cleaner assemblies, housings, serviceable filter cartridges and features, components, and methods, relating thereto are disclosed. In general, the features relate to systems that are configured to aid in inhibiting an improper cartridge from being installed in an air cleaner housing, during servicing. A variety of features are characterized, and in many examples, the cartridge includes a seal arrangement having radially directed seal surface with at least a first non-wavy or non-projection/recess section and a second wavy or projection/recess section. Examples are shown and described in detail.

A hollow filter element, including: a filter medium for filtering a fluid; wherein the filter element is a conical-oval rounded filter element; wherein the filter medium circumferentially surrounds an interior flow space of the filter element, wherein the filter medium circumferentially encloses around an element axis such that filter medium at least in one direction radial to the element axis is smaller on a first of the end sides of the filter medium than on a second of the end sides of the filter medium; wherein the filter medium has a first end body arranged at least on the smaller end side; wherein the first end body has at least one leveling element in the at least one direction of the smaller extent with respect to the element axis in a radially outer segment with respect to the element axis.

An annular filter element has a filter medium body that can be flowed through in a radial direction by a fluid to be cleaned. A central tube is arranged at an inner side of the filter medium body. A support collar is connected to the central tube and provides an end face forming an axial support surface for a housing component of a filter housing. A sealing element is connected to the support collar. The support collar has a radial side face, wherein the radial side face carries the sealing element and forms a sealing surface for the housing component, wherein the sealing surface is spaced apart from the axial support surface. The support collar is formed together with the central tube as one piece.

A filter holder (2) for a filter element (3) that has an oval-shaped cross section transverse to a longitudinal direction (LR) thereof, with a receiving section (19) for receiving the filter element (3), a fluid inlet (24) for allowing fluid (L) to be filtered into the filter holder (2), and a fluid outlet (25) for letting the fluid (L) filtered with the aid of the filter element (3) out of the filter holder (2), wherein the fluid inlet (24) is arranged such that an inflow direction (E) of the fluid (L) to be filtered is oriented in the direction of a lateral surface (29) of the filter element (3) that can be received in the receiving section (19), whereby the fluid (L) to be filtered flows tangentially around the filter element (3) that can be received in the receiving section (19) in order to separate particles (33) contained in the fluid (L) to be filtered on a wall (30) of the receiving section (19) with the aid of centrifugal force.

A filter receptacle (2) for a filter element (3) that, transversely to a longitudinal direction (LR) thereof, has an oval cross section, said filter receptacle having a receiving portion (19) for receiving the filter element (3), a fluid inlet (24) for allowing fluid to be filtered (L) into the filter receptacle (2), and a fluid outlet (25) for discharging the fluid (L) filtered with the aid of the filter element (3) from the filter receptacle (2), wherein the fluid outlet (25) is arranged such that an outflow direction (A) of the filtered fluid (L) from the fluid outlet (25) is oriented parallel to the longitudinal direction (LR) of the filter element (3), and wherein the fluid outlet (25) has a circular cross section facing away from the filter element (3) and an oval cross section facing toward the filter element (3).

A filter element for filtration and dehumidification of a gas has at least one filter medium body with an outflow side delimiting a clean-side flow chamber. A dehumidification unit is arranged downstream of the at least one filter medium body in a flow direction of the gas in the clean-side flow chamber. A carrier body accommodates the at least one filter medium body and the dehumidification unit. The dehumidification unit is connected flow-tightly to an outflow opening of the clean-side flow chamber. The dehumidification unit is arranged in the clean-side flow chamber at a spacing relative to the at least one filter medium body.

A sealed intake air system incorporates a positive connection seal interface between the air filter and the airbox with captive fasteners to provide a positive connection between the air filter and the one-piece airbox.

A filter assembly has a main filter element disposed in a filter housing and provided with an end disk with a first sealing element that seals the main filter element relative to the filter housing. A secondary filter element is disposed in the filter housing and is provided with an end disk with a second sealing element that seals the secondary filter element relative to the filter housing. The end disk of the secondary filter element is arranged relative to an axial direction of the filter assembly between the end disk of the main filter element and the filter housing. The end disk of the secondary filter element is arranged inside a flow cross section of a fluid outlet of the filter housing. The end disks of the main filter element and of the secondary filter element are axially supported on each other at least over sections thereof.

A filter element has a filter bellows of filter medium laid into folds. The folds extend between oppositely positioned end edges of the filter bellows, respectively. The end edges form oppositely positioned end edge surfaces. The filter bellows is arranged in closed configuration about a longitudinal axis and encloses a hollow space. The filter bellows has opposed end faces sealed by an end disc. The filter bellows has a cut portion in at least one of the oppositely positioned end edge surfaces such that one or more regions of folds with shortened fold length are formed. A fold length of the folds with shortened fold length is substantially identical at an outer and inner circumference of the filter bellows. A filter system has a housing in which the filter element is arranged. One of the housing parts has a region corresponding to the cut portion of the filter bellows.

A round filter element has a filter medium body flowed through by a fluid to be purified in radial direction relative to a longitudinal axis of the filter medium body. The filter medium body radially encloses an inwardly positioned flow space. An end disk is arranged at an end face of the filter medium body. The end disk has a shaped body axially delimiting the inwardly positioned flow space. The end disk has a sealing disk arranged externally at the shaped body, wherein the sealing disk covers the shaped body and the end face of the filter medium body. The shaped body has a receiving depression that is flow-tight relative to the inwardly positioned flow space. The sealing disk has a receiving opening aligned with the receiving depression of the shaped body. The receiving depression and the receiving opening can receive a support element of a filter housing.