An air purifier device is provided including a fan unit including a fan arranged to produce an air flow through the air purifier device, and a filter unit including a filter arranged to filter the air flow produced by the fan. The filter unit is adapted to stand on a support surface when the air purifier device is positioned for use. The air purifier device further includes a coupling mechanism arranged to secure the fan unit on top of the filter unit. The coupling mechanism includes two release means arranged on opposite outer sides of the fan unit, and the fan unit is releasable from the filter unit by actuating the two release means. The filter unit may be removed from the fan unit by a single action (or movement) by the user, whereby filter replacement of the air purifier device is facilitated.

A filter structure is provided which has a rectangular shape in plan view, and which includes a filter body, an adhesive layer and a release sheet. The filter body incudes, at its four corners, pinched portions on which the adhesive layer is not formed. Each of the pinched portions has a width defined by a distance between the outer edge of the filter body and the outer edge of the adhesive layer, and the distance is 9 mm or more and 35 mm or less. By pinching one of the pinched portions, it is possible to separate the release sheet from the filter body.

An air filter includes a frame portion including an outer frame and an inner frame. The outer frame is a frame body forming an outer contour and formed with an opening. The inner frame is provided within the outer frame and partitions the opening of the outer frame into a grid shape. A filter portion is provided on the frame portion to cover sections surrounded by the outer frame and the inner frame, the filter portion adsorbs dust, and one side of the frame portion is totally flat.

The filter unit includes a filter section having a first filter and a second filter being of a pleated shape, and a frame having a pair of first frames and a pair of second frames having an adhesive layer. The filter unit is manufactured by stacking the first filter on the second filter, arranging a first support member opposite to the first frame with respect to a first fixed portion, arranging a second support member for supporting the second fixed portion opposite to the first frame with respect to the second fixed portion, fixing the first frame to the first fixed portion and the second fixed portion, and fixing the first frame to the second frame.

The present invention relates to a vacuum cleaner filter bag for an upright vacuum cleaner. The vacuum cleaner filter bag according to the invention thereby has a greater length than width, one long side and one narrow side resulting. It is formed from two bag walls which are joined together circumferentially so that an internal space is configured between the two bag walls. One bag wall thereby has an inlet opening through which air to be cleaned can flow into the vacuum cleaner filter bag. The vacuum cleaner filter bag according to the invention is distinguished by the bag wall in which the inlet opening is introduced having folding which extends in the longitudinal direction of the vacuum cleaner filter bag, as a result of which this bag wall has increased flexibility and the vacuum cleaner filter bag opens during folding-over of the retaining plate when inserting the filter bag in a vacuum cleaner such that the air can enter essentially unimpeded into the filter bag.

An axial flow filter contains: a filtration unit. The filtration unit includes at least one filtering material and plural connection materials. Each filtering material spirally rolls outward from its inner end, and said each filtering material has a small-diameter portion formed on the inner end thereof and has a large-diameter portion arranged on an outer end thereof. Between the small-diameter portion and the large-diameter portion defines a height difference, said each filtering material rolls outward to define a gap between any two adjacent filter layers, and a first connection material is fixed between said any two adjacent filter layers and is coated along a middle section of said each filtering material as said each filtering material rolls outward, such that said any two adjacent filter layers of the at least one filtering material are spaced at a fixed distance so as to stop the gap.

A filter element including a first filter media pack with an inlet face and an outlet face and a second filter media pack with an inlet face and an outlet face. The second filter media pack is formed separately from the first filter media pack and is coupled to the first filter media pack such that the respective inlet faces and outlet faces of the first and second media packs do not overlap. The first filter media pack and the second filter media pack each include a corresponding filter media pack characteristic, and the filter media pack characteristic of the first filter media pack is different from the corresponding filter media pack characteristic of the second filter media pack. Exemplary filter media pack characteristics include the length, width, height, shape, media density, layer spacing, pleat bend angle, pleat density, and material composition of the first and second filter media packs.

An air filter media construction or arrangement is disclosed. The air filter media construction or arrangement includes facing media secured to fluted media. A preferred projection/receiver arrangement is described. Also, a useful seal arrangement is described. Air cleaner assemblies, methods of assembly and use are also provided.

Reusable frames for air filters, framed air filters, kits for making framed air filters, and methods of making and using framed air filters. The frame may include a frame base and a frame cover that are attached to each other to form the frame. The frame may include first and second opposing primary frame portions that respectively include first and second upward-open-ended elongate slots that are configured to receive first and second securing tabs of an expandable pleated air filter. The frame may include a set of upward struts that collectively form an upward anti-sag lattice with a multiplicity of anti-sag protrusions that protrude in a downward direction from a downward face of the upward anti-sag lattice.

[Problem] To provide an air filter capable of ensuring airtightness.

[Solution] An air filter includes a filter body that has a rectangular shape having four sides, a filter frame that has a rectangular shape having sides, and surrounds the filter body, and a gasket 6 that is disposed between the filter frame and the filter body along the four sides of the filter body, and has a set of end portions joined at at least one corner portion of the four sides. One end portion 6b of the set of end portions has a convex portion 21 that protrudes toward the other end portion 6a of the set of end portions, and the other end portion 6a of the set of end portions has a concave portion 22 that mates with the convex portion 21.