A filter element for filtering a fluid has one or more filter bellows with a specified raw side and a specified clean side oppositely positioned relative to the specified raw side. The filter bellows has a filter medium that is folded along fold edges in a zigzag shape to folds, wherein the folds extend between oppositely positioned end edges of the at least one filter bellows, wherein the filter bellows has parallel extending end edge faces at oppositely positioned end faces. At least one pre-separator embodied as a flat mat is arranged at the raw side of the filter bellows. A frame is injection-molded from plastic material around the filter bellows and seals the end edge faces. The pre-separator is fastened to the raw side with fastening elements arranged at the frame. A filter system with a filter housing is provided with such a filter element.

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.

Air cleaner assemblies, components, features and methods of assembly and use are described. Example air cleaner assemblies are depicted and described in which a main filter cartridge sealing surface is recessed from an open end of a housing body. An access cover of the housing is configured with a portion extending inwardly to engage a main filter cartridge portion and bias it against the main filter cartridge sealing surface. In selected assemblies, the portion of the access cover extending inwardly toward the main filter cartridge, is a precleaner having flow separator tubes therein.

An air filter assembly includes a filter element having at least one variable dimension, and a frame for engaging and supporting the filter element. The frame may include a plurality of linear segments forming a rectangular configuration, and a plurality of clips for connecting the linear segments together at corners thereof. The linear segments may be L-channel segments, C-channel segments, or may be of other form. Clips may be used for connecting the linear segments together at the corners. The filter element may have a pattern of creases or fold lines to facilitate folding thereof from an expanded configuration to a reduced configuration. A grate may be included for spanning an area bounded by the frame to support the filter element. The grate may have multiple arms and a central hub. An edge treatment may form a seal between the filter element and the frame.

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.

A rear cover assembly structure of an air purifier allows for rapid opening and demounting of a rear cover and includes a housing, the rear cover, a hooking mechanism, and a magnetic connection mechanism. The rear cover can be assembled on or detached from the housing by the hooking mechanism and the magnetic connection mechanism. The hooking mechanism includes a groove set on the housing and a shaft set on rear cover. The shaft being set in the groove or separated from the groove respectively locks or unlocks the hooking mechanism. The magnetic connection mechanism includes a magnetic assembly set on the housing and a metal sheet set on the rear cover, the metal sheet is attracted to the magnetic assembly. The metal sheet is set on the housing by a fixed structure of the housing.

A filter element comprising a filter media and an outer surface. The filter media is formed in a closed loop, the closed loop defining a hollow interior extending along a longitudinal axis between a first end of the filter media and a second end of the filter media. The outer surface surrounds a perimeter of the filter element and is defined by a substantially circular first portion and at least one second portion. The first portion is substantially circular at a selected height of the filter media, and the at least one second portion is depressed relative to a circle defined by the substantially circular first portion at the selected height.

A filter system for filtering a fluid has a filter housing with housing top part and housing bottom part, wherein the housing top and bottom parts extend along a housing axis. A filter pack arranged in the filter housing separates fluid-tightly a clean fluid side and a raw fluid side from each other. The filter pack has a filter element with a hollow cylinder-type filter bellows arranged about a longitudinal axis of the filter element. The filter element has a first substantially closed end face and a first end disk arranged thereat, wherein the first end disk is positioned opposite a second end disk of the filter element. The second end disk has a fluid passage for filtered fluid. A resonator with an end closed by a bottom is arranged inside the filter pack such that the bottom is oriented toward the first end disk of the filter element.

A filter for in-line or inlet applications. The filter may include a spindle for supporting a filter element. In some embodiments, the spindle may be fixedly attached to a filter cap or filter body. The filter may be used as an in-line filter with a hose or tube on the inlet and outlet ports of the filter cap and filter body. In addition, or alternatively, a filter consistent with the present disclosure may be provided with a splash cap that allows use of the filter as a protected inlet for fluid flow. When used as an inlet filter, fluid may enter the filter through the splash cap and exit the filter through hose or tube coupled to the filter body. Both uses allow for serviceability.

A system for improving an air-quality of a given space serviced by an exit register of an AC system including a base frame device that is configured to engage the exit register, a metal base frame section for engaging the base frame device with a perimeter of the exit register. A register cover device that is configured to magnetically engage the base frame device. The register cover device having a plurality of alternating open space portions, a plurality of air diverting fin segments, and a magnet holder implement. The magnet holder implement includes at least four magnet holders that are disposed on each end corner portion of the register cover device. At least four height adjustable magnets are disposed on each of the magnet holders, wherein each of the height adjustable magnets is configured to magnetically engage the register cover device with the base frame device.