A filter element has a filter element housing with first and second outwardly open receiving pockets. A first filter medium body is disposed in the first receiving pocket. A second filter medium body is disposed in the second receiving pocket. The first and second filter medium bodies delimit a common clean chamber that communicates with an outflow opening for purified fluid. The first receiving pocket has a circumferential first support rim on which the first medium body is supported. The second receiving pocket has a circumferential second support rim on which the second filter medium body is supported. The first receiving pocket has a first receiving wall partially enclosing the first filter medium body and extending outwardly away from the first support rim. The second receiving pocket has a second receiving wall partially enclosing the second filter medium body and extending outwardly away from the second support rim.

A filtration material of the present invention comprises a bulky fiber sheet layer having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer in which two or more types of fibers different in constituent resin are mixed, wherein constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layer. A three-layer filtration material of the present invention comprises bulky fiber sheet layers having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer, which is located between the bulky fiber sheet layers, wherein the constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layers, and both bulky fiber sheet layers contain fibers having a limiting oxygen index of 20 or more, and have a mass per unit area 0.5 times or more than that of the triboelectrically-charged nonwoven fabric layer. A filter element of the present invention comprises the filtration material in a pleated state.

The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

A single-layer spunbonded air-filtration web including meltspun autogenously bonded electret fibers with an Actual Fiber Diameter of from 3.0 microns to 9.0 microns. The air-filtration web exhibits a mean flow pore size of from 8.0 to 19 microns and exhibits a ratio of mean flow pore size to pore size range of from 0.55 to 2.5. Also disclosed are methods of making such webs, and methods of using such webs to perform air filtration.

A filter element has, on a filter element housing, a first and a second filter medium body, which are arranged at an angle to each other.

An illumination device for an air cleaner assembly includes a housing and a number of light sources attached to the housing for emitting light to produce a glowing appearance.

Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

A filter cartridge arrangement is provided which includes a media pack comprising Z-filter media, a preform and a housing seal member. Improvements in the preform and seal member are described which include: a single beveled surface of the seal member to facilitate installation; and, an inside region of the seal member having a tip adjacent in inwardly directed lip of the preform, to control flash during molding. A variety of media pack configurations and features are described.

Various high performance, high efficiency filter media are provided that are cost effective and easy to manufacture. In particular, various filter media are provided having at least one layer with a waved configuration that results in an increased surface area, thereby enhancing various properties of the filter media. The filter media can be used to form a variety of filter elements for use in various applications.

A filtration system comprising a housing defining a central compartment, an outlet and a housing sealing surface having a first non-planar surface. A cover is removably coupled to the housing. The cover defines an inlet and comprises a cover sealing surface having a second non-planar surface. The filtration system also includes a filter element comprising a filter media and a seal member. The filter element is removably received in the central compartment. The seal member comprising a complimentary non-planar sealing surface that matches the first non-planar surface and the second non-planar surface such that the seal member axially pinched between the housing and the cover by the housing sealing surface and the cover sealing surface to form a first seal between the seal member and the housing and a second seal between the seal member and the cover.