A filter element is provided for being removably arranged in a filter housing, the filter element including a filter material body. The filter element is adapted to assume a first state, in which it has a substantially flat shape, and a second state, in which it has such a curved shape, such that opposite outer peripheral sides of the filter element are directed towards each other and in which it is adapted for a filtering operation. The filter element is adapted to be locked in the second state when arranged in the filter housing. A filter system is also provided including a filter element and an anchoring device adapted to be arranged between the opposite outer peripheral sides of the filter element when it is curved to the second state.

A filtration device including a contoured support having 1) an interior surface, 2) an outside peripheral surface spaced farther from a center of the contoured support than the interior surface, and 3) a rim enclosed and sealed to a perimeter of the contoured support. The filtration device includes macroscopic openings in the contoured support extending from the interior surface to the outside peripheral surface, and a plurality of nanofibers having diameters less than 1 micron. The nanofibers are disposed on the outside peripheral surface of the contoured support, and cover the macroscopic openings to form a filtration medium on the contoured support.

A filter element may include a filter medium extending in an extension direction and including a filter material separating clean and raw sides of the filter element, and two seals arranged at two end faces of the filter medium located opposite one another in the extension direction, so that an inner side of each seal may be arranged lying against the associated end face in a fluid-tight manner. The two inner sides, jointly with an inner circumferential side of the filter medium, may partly limit a filter element interior space. The filter medium, in a section running perpendicularly to the extension direction, has an open U-geometry or V-geometry with two legs.

A filter element has a curved filter medium body, which at least partially encloses a flow chamber, and a carrier connector that is guided through the filter medium body. The carrier connector is a carrier of a sealing element for sealing the contact with a flow channel, wherein a section of the sealing element is arranged between the carrier connector and the filter medium body.

An air filter system for a motor vehicle includes a common housing, first and second D-shaped filter elements and a common cover. The common housing defines a first airflow chamber extending between a first inlet duct and a first outlet duct and a second airflow chamber extending between a second inlet duct and a second outlet duct. The first airflow chamber is fluidly separated from the second airflow chamber. The first D-shaped filter element is disposed in the first airflow chamber for filtering air passing through the first airflow chamber. The second D-shaped filter element is disposed in the second airflow chamber for filtering air passing through the second airflow chamber. The common cover is secured to the housing and closes the first airflow chamber and the second airflow chamber.

A hand vacuum cleaner may have a first stage cyclone having a first stage cyclone chamber and a second stage cyclone downstream from the first stage cyclone and at least substantially nested in the first stage cyclone. A screen is positioned laterally outwardly from the second stage cyclone and defines a passage positioned between an inner side of the screen and the outer wall of the second stage cyclone. A directing member is located in the passage, the directing member having, in the rotational direction, a directing surface facing towards the flow of air in the passage, the directing surface extending from an upstream end located in the passage and a downstream end located proximate the second stage cyclone air inlet port wherein the directing surface extends generally linearly.

An air filtration equipment, the air filtration equipment is installed in an ventilation area at an interface between indoor and outdoor spaces of a fixed space, the equipment including: a sensor configured to sense information on inhalable particles in outside air; at least one filtering layer configured to filter out inhalable particles in air entering from the ventilation area into the indoor space; and a control device connected with the sensor and the at least one filtering layer and configured to control the at least one filtering layer to expand according to the information sensed by the sensor, such that the expanded at least one filtering layer covers the ventilation area. Also, a screen window and a window are provided.

According to the present disclosure, features, components and techniques useable for providing air cleaner arrangements are provided. Many of the features relate to an axial seal arrangement provided on a filter cartridge. A typical filter cartridge, for use with these features, is a filter cartridge having opposite flow ends. Example media arrangements that fit this characterization are described. Seal arrangements provided with an axial housing sealing engagement surface are shown. A seal arrangement is provided. Also, air cleaner assemblies having advantageous features therein are provided. Further, air cleaner housings are described, with selected, preferred features for engagement with filter cartridges.

A strip-shaped filter in the shape of a circular arc is arranged at a port opening portion of an oil passage, the port opening portion being in maximum proximity to a spool hole portion or a valve element, to prevent a contaminant in the oil passage from reaching the spool hole portion or the valve element. A groove portion is arranged to extend in a circumferential direction in a wall surface of the upper body which defines the spool hole portion. The port opening portion is defined in the groove portion, and is connected to the oil passage. The filter is housed in the groove portion to close the port opening portion defined in the groove portion.

A steam strainer and a method for producing a steam strainer is provided. The steam strainer has a skeleton-like tube body, in which, to construct a shell surface, at least two shell-type individual elements are provided for mounting, wherein the skeleton-like tube body has two end surfaces which are kept at a defined spacing by at least one longitudinal strut connecting the two end surfaces, and wherein the at least two shell-type individual elements have a plurality of screen openings, and wherein the at least two shell-type individual elements and the longitudinal strut are independently exchangeable. In addition, a method for producing such a steam strainer is provided.