A filter device for ambient air filtration has a blower housing with air inlet and air outlet. A device for generating an air flow is arranged in the blower housing and generates an air flow in operation from air inlet to air outlet. A flexible air conducting hose is provided with a first open end connected to the air outlet of the blower housing and with a second closed end. The flexible air conducting hose has openings arranged between first open end and second closed end. Filter elements are arranged in the openings, respectively. The filter elements separate a raw side inside the air conducting hose from a clean side downstream of the filter element. The air conducting hose is inflated in operation of the device by the air flow. The flexible air conducting hose has a reduced air permeability compared to the air permeability of the filter elements.

An air cleaner assembly, a main filter element, a safety element, combinations and methods for servicing an air cleaner assembly are provided according to the present invention. The air cleaner assembly includes an air cleaner housing and a main filter element. The air cleaner housing includes a safety liner that supports the main filter element, and can be configured to help reduce the tendency of the main filter element to rotate during use of the air cleaner assembly. A safety element having two open ends, for use with such an assembly is described.

An end cap for a filter element may include an element receiver configured to be coupled to a tubular member, and a base passage receiver in flow communication with the element receiver. The end cap may further include an end cap barrier extending outward from the base passage receiver, the end cap barrier including a first side configured to face a filter base. The end cap may also include end cap flow passages configured to provide flow communication between filter media and a filter base, and including a passage opening spaced a first distance from the first side. The end cap may further include a barrier edge and a peripheral seal, wherein an uppermost surface of the peripheral seal terminates a second distance from the first side of the end cap barrier, wherein the first distance is greater than the second distance.

In one aspect, a modular filter assembly for filtering fluid that flows in a flow direction therethrough is disclosed. The assembly includes a first housing section having a first filter element; a second housing section having a second filter element; and a connector disposed between the first and second housing sections. A housing includes the first housing section, the connector, and the second housing section. The flow direction is through the first and second filter elements in series.

The invention relates to a closure device (28) for a filter unit (1) for the mutual and releasable insertion into a return air duct or exhaust air duct (2) of a barrier system (3), comprising a main body (30), an opening (6) in the main body (30) that can be peripherally bounded by an annular seal (11), a lid (10) that can be switched between an open position in which the opening (6) is open and a closed position in which it bears in a sealing manner against the annular seal (11) in order to selectively open and close the opening (6) and that has passing through it an imaginary longitudinal axis (A), wherein the lid (10) is connected in an articulated manner to the main body (30) so as to be able to pivot by means of at least one rotary articulation (40) through which there passes a pivot axis (S). The lid (10) is designed so as to be able to pivot at least double-eccentrically, wherein the first eccentricity arises from the fact that the pivot axis (S) is arranged at a distance (A.sub.1) from a plane (E.sub.1) in which a closure section ( ) of the lid (10) lies, and wherein the second eccentricity arises from the fact that the pivot axis (S) is arranged at a distance (A.sub.2) from a vertical longitudinal mid-plane (E.sub.2) which passes vertically through the center of the lid (10) when the latter is in its closed position.

A fluid filter element for circular locking engagement with a filter support, the fluid filter element including a filter medium arranged about a longitudinal axis, first and second end caps arranged at opposite cylindrical ends of the filter medium and sealed thereto, at least one locking protrusion located on the second end cap for rotatably locking the fluid filter to the filter support and at least one releasable retainer located on the second end cap and associated with at the at least one locking protrusion for retaining the at least one locking protrusion in locking engagement with the filter support and being operative, when released, to allow rotatable unlocking of the fluid filter element.

The disclosure concerns air cleaners. Preferred air cleaners are shown which include a housing and a removable and replacement primary filter cartridge. Optional and advantageous features are shown. The preferred primary filter cartridge is conical in shape. A preferred optional safety or secondary filter cartridge is shown. Preferred methods of assembly and use are provided.

An air filter mounting plate having sealing side and a filter media retaining side, said mounting plate including an air passage opening and a gasket encircling the air passage opening provided on sealing side of the mounting plate, the gasket comprising a connection portion and double sealing lips (7a,7b) extending from the connection portion, and wherein the gasket is joined with the mounting plate by the connection portion being fixed on the sealing side of the mounting plate.

A Twist-interlocking Engine Housing and Air Filter System and Method is disclosed. The filter assembly provides unequaled ease of installation and removal, as well as superior sealing between the housing and the filter assembly. For installation, the user needs only to insert the filter into the housing and then give the filter assembly a one-quarter turn or less to lock the filter assembly into the housing. There are features within the filter base that snap-locks the filter in place to resist inadvertent loosening. Finally, the housing and filter are designed so that the outer flange of the filter base is recessed into the side of the housing in order to prevent the intrusion of unwanted grime and/or fluids.

An air cleaner assembly is disclosed, along with related methods. In one aspect, the air cleaner assembly has a housing including a housing body and a removable cover that together define an interior volume for holding a filter cartridge. The housing body can include a first plurality of lugs, wherein each of the first plurality of lugs has a first engagement surface disposed at a first angle that is oblique to a rotational plane of the cover. A second plurality of lugs can be provided on the cover, wherein each of the second plurality of lugs has a second engagement surface disposed at the first angle. A lock mechanism can also be provided that is disposed on the cover, wherein the lock mechanism includes a lock member axially movable between a locked position and an unlocked position to selectively secure the cover to the housing body.