A filter assembly including: a first filter medium that is bent so that high-point portions and low-point portions defined based on a vertical plane with respect to a first direction are alternately and repeatedly formed in a second direction perpendicular to the first direction; a first filter frame configured to accommodate the first filter medium and to fix an edge side of the first filter medium; a second filter medium that is bent so that the low-point portions and the high-point portions based on the vertical plane with respect to the first direction are alternately and repeatedly formed in the second direction; and a second filter frame configured to accommodate the second filter medium and to fix an edge side of the second filter medium, wherein at least a portion of the high-point portions repeatedly formed in the first filter medium have different heights from those of the other high-point portions, and at least a portion of the low-point portions repeatedly formed in the second filter medium have different heights from those of the other low-point portions, and the first and second filter media are bent in such a way that a first filter medium high-point envelope connecting high points of the first filter medium and a second filter medium low-point envelope connecting low points of the second filter medium correspond to each other when viewed from a cross-section including the first direction and the second direction, and the first and second filter frames are combined with each other so that the first filter medium high-point envelope and the second filter medium low-point envelope face each other.

A filter element for filtering a fluid passing through the filter element, the filter element having a fluid entry face and a fluid exit face and is provided with a group of first channels and a group of second channels, through which the fluid to be filtered can flow from the respective first channel into the second channel, that is arranged next to it, wherein a through-channel leads through a filter pack from the fluid entry face to the fluid exit face, which through-channel has an opening at the fluid entry face and/or has an opening at the fluid exit face, wherein an element closes the flow of fluid through through-channel, while leaving a volume open inside the through-channel that is at least 10% of the volume that the through-channel would have without the element, or the element allows the flow of fluid through the through-channel and interacts with the flow of fluid through the through-channel and/or the sidewalls of the through-channel deviate at least in some areas from a cylindrical wall in order to thereby create an element that interacts with a flow of fluid through the through-channel.

A filter element for filtering a fluid passing through the filter element, the filter element having a fluid entry face and a fluid exit face and is provided with a group of first channels and a group of second channels, through which the fluid to be filtered can flow from the respective first channel into the second channel, that is arranged next to it, wherein a through-channel leads through a filter pack from the fluid entry face to the fluid exit face, which through-channel has an opening at the fluid entry face and/or has an opening at the fluid exit face, wherein an element closes the flow of fluid through through-channel, while leaving a volume open inside the through-channel that is at least 10% of the volume that the through-channel would have without the element, or the element allows the flow of fluid through the through-channel and interacts with the flow of fluid through the through-channel and/or the sidewalls of the through-channel deviate at least in some areas from a cylindrical wall in order to thereby create an element that interacts with a flow of fluid through the through-channel.

A system and method of operating an air cleaner assembly including a selective scavenging apparatus that may be configured to actuate in response to a pulse cleaning operation. The air cleaner assembly may include an air cleaner housing, filter media positioned within an interior space of the air cleaner housing, a pulse cleaning apparatus extending into the interior space, and the selective scavenging apparatus in fluid communication with an egress aperture of the air cleaner housing. The selective scavenging apparatus may be configured to move fluid and sediment out of the air cleaner housing during a scavenging time period and the pulse cleaning apparatus may be configured to direct a pulse of gas into the clean air space during a cleaning operation. The scavenging time period may start based on the beginning of the cleaning operation and may end based on the completion of the cleaning operation.

A secondary filter element for a filter arrangement is provided with a filter medium and a circumferentially extending sealing device that seals the secondary filter element in respect to a filter receptacle of the filter arrangement. The circumferentially extending sealing device has an oval geometry with a long side and a short side. The circumferentially extending sealing device has an outer surface projecting, in a radial direction of the secondary filter element, farther past the filter medium when viewed along the short side compared to when viewed along the long side. A filter arrangement has a filter receptacle. A main filter element is received in the filter receptacle, and a secondary filter element is received in the main filter element. The circumferentially extending sealing device of the secondary filter element projects in a radial direction of the secondary filter element outwardly past an interior of the main filter element.

An air cleaner includes an intake filter seated on an air cleaner body, an air cleaner cover spaced apart from the intake filter and coupled to the air cleaner body, and a cover rigidity reinforcement member detachably coupled to the intake filter and configured to restrict displacement toward the intake filter. The intake filter includes a non-woven fabric configured to filter foreign matters of introduced outside air, and a filter frame surrounding and fixing a circumference of the non-woven fabric.

A system for air decontamination in a three-dimensional space described herein includes an air inlet for drawing in air, an air outlet for administering filtered air, and a filter device for filtering air prior to administration through the air outlet, the system is configured to draw air in a substantially vertical laminar flow from a ground of the space to the air inlet. A filter device for filtering ultrafine particles from a gas described herein includes a first filter medium for absorbing polar liquids but not ultrafine particles; in fluid communication with a second filter medium for absorbing ultrafine particles; and a gas outlet, the first filter medium is configured to allow vaporization of the absorbed polar liquids; the device is configured to guide the gas from the first to the second filter medium and through the second filter medium; and the second filter medium forms the gas outlet.

The present invention relates to a dust collecting filter and a method for manufacturing a dust collecting filter. The dust collecting filter of the present invention may include: a first filter medium that is bent into a corrugated shape and forms a plurality of bent portions; a plurality of first electrodes disposed on one surface of the first filter medium along the corrugated shape of the first filter medium and to which a high voltage is applied; and a plurality of second electrodes disposed along the corrugated shape of the first filter medium so as to be spaced apart from each other between the plurality of first electrodes and are grounded.

An upright two-stage dust collector includes a base unit, a suction blower unit, a filter unit and a dust collecting unit. The suction blower unit has a suction blower body. The filter unit includes a filter body, a coarse particle dust filter cartridge disposed in the filter body, and a fine particle dust filter element disposed in the coarse particle dust filter cartridge. The fine particle dust filter element is coaxially inserted in the coarse particle dust filter cartridge. The air after the first dust collection is filtered by the fine particle dust filter element to perform the second dust collection. Through the combination of the above units, in addition to a two-stage dust collecting effect, the dust collector occupies less space and can be used conveniently.

A filter system (100) having a housing (110), a fluid inlet (102) formed in a housing wall (112), a fluid outlet (108) formed in a housing wall (120), a primary filter element (50) and a secondary filter element (10). The secondary filter element (10) arranged on a stand pipe (150) rigidly connected to one of the housing walls (120). The primary filter element (50) comprises a first end cap (52) at its top region (53) and a second end cap (54) at its bottom region (55). The housing wall (120) accommodates the stand pipe (150) and the bottom region (55) of the primary filter element (50), which are configured with mutual self-positioning elements (92, 62) to accommodate the primary filter element (50) on the housing wall (120) in a defined rotational position with respect to one or more struts (170) of the stand pipe (150).