A filtration media pack is provided having a plurality of layers of single facer media. The layer of single facer media includes a fluted sheet, a facing sheet, and a plurality of flutes extending between the fluted sheet and the facing sheet and having a flute length extending from a first face to a second face of the filtration media pack. A first portion of the plurality of flutes are closed to unfiltered fluid flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes are closed to unfiltered fluid flowing out of the second portion of the plurality of flutes so that fluid passing into one of the first face and the second face of the media pack and out the other face of the media pack passes through media to provide filtration of the fluid.

The disclosure is directed toward presses which may comprise planar or curved press plates that can be driven toward and away from each other such as via linear reciprocating movement to press filter media sheets as opposed to using rolls. The press plates can create such features as embossments that may have the ridges and grooves, brands, creases or other such features. The press can create pleated packs or individual panels for non-pleated packs. Additionally, a variety of embossed pleat packs, unique shapes, structural components and other pleat packs that may be formed by presses or other methodology are disclosed as well as filter cartridges using such pleat packs.

The present disclosure is directed toward assembly of pleat packs using a welder and an anvil that can push adjacent pleat panels together along a crease. Other aspects are directed to welding pocket pleats and welded pocket pleats formed thereby that are suitable for filter fluid and ultrasonically cutting and sealing seams into filter media using a welding assembly such as an ultrasonic sonotrode and an anvil.

A cassette filter for cleaning a fluid includes: a frame; and a plurality of filter elements having a filter medium provided with a folding. The plurality of filter elements are accommodated in a frame such that at least two adjoining filter elements of the plurality of filter elements are arranged at an acute angle to one another and form a V-shaped arrangement. Each of the plurality of filter elements has folded edges which are formed by fold peaks and fold valleys and extend perpendicularly to legs of the acute angle. Each filter element of the plurality of filter elements is provided with foldings such that a height of the respective filter element is smaller at all edge regions than a height in a central region of the respective filter element, and smaller folding surfaces than the central region result at the edge regions.

The present disclosure relates generally to air intake filter assemblies, and more particularly to air intake assemblies for an outdoor portion of a heating, ventilation, and/or air conditioning (HVAC) system. In an embodiment, a filter assembly is configured to filter an airflow entering an air intake of a HVAC unit. The filter assembly includes a first layer of a first coarse mesh, a second layer of a second coarse mesh, and a fine filter disposed between the first layer and the second layer. Additionally, the fine filter includes an upper level and a lower level with respect to the airflow, and wherein the lower level facilitates accumulation of fine debris captured from the airflow entering the air intake of the HVAC unit.

Pleated filtration media, media packs, filter elements, and methods for filtering fluid are provided which contain three dimensional flutes in the media surface, the flutes configured to improve filter performance. In certain embodiments the flutes have defined peaks that reduce masking between adjacent pleats, the flutes have ridges along their length to modify flute cross sectional geometry, and/or the flutes provide for volume asymmetry across the media.

Filter media packs that utilizes a zig-zag folding pattern on deeply corrugated filter media are described. The filter media is scored, folded, and secured into position to form the filter media pack. The filter media pack may be secured using a self-supporting structure (e.g., via tacking adhesive used to secure adjacent folds). The filter media pack contains unique features to optimize filtration performance, such as maximized inlet and outlet face flow areas. In some arrangements, the filter media pack exhibits improved flow characteristics and dust-holding capacity via upstream and downstream channels that have different cross-section al shapes and/or sizes. The upstream and downstream channels may comprise, for example, circular, diamond shaped, or fish-scale shaped openings.

A vehicle cabin filter assembly comprising a housing and a plurality of filter modules mounted to the housing. The filter modules comprise a first filter module, a second filter module positioned downstream of the first filter module, and a third filter module positioned downstream of the second filter module. Each filter module comprises a particulate filter element, and at least one of the filter modules comprises a gas filter element. The second filter module has a separation efficiency higher than the first filter module, and the third filter module has a separation efficiency higher than the second filter module.

A vehicle cabin filter assembly comprising a filter module and a further filter module positioned downstream of the filter module. Each filter module comprises one or more filter elements. The filter elements of the filter module are pleated at a first pleat pitch and comprise a gas filter element. The filter elements of the further filter module are pleated at a second pleat pitch and comprise a particulate filter element. And the second pleat pitch is smaller than the first pleat pitch.

An environmental air cleaning device for a road vehicle removes dust, particulate matter, and/or gases from environmental air. The environmental air cleaning device has one or more filter elements. The environmental air cleaning device is provided with a mounting device that rigidly couples to a vehicle-side mounting device for roof loads. A road vehicle with such an environmental air cleaning device is provided.