Abstract: A combined filter, for removing solid particles and noxious gases from air to be delivered into the cabin of a vehicle, as part of a ventilating, heating and/or air conditioning system, comprises two layers of a non-woven tissue such as polypropylene, between which are deposited activated carbon granules. The two layers of non-woven tissue are interleaved at least partially, so as to trap the granules between them.

Abstract: A filter arrangement made up of an accordion fold pack which is sealingly arranged in a housing. The housing is deep drawn in one piece from a polymeric material sheet. A limit stop is punched out of the base of the housing. A seal surrounds the accordion fold pack and seals against the housing.

Abstract: An air cleaner that locks two shells together by a cam action is disclosed having two shells with interlocking fingers staggered along at least one length of the joint between the first and second shells. A cam is inserted between the interlocking fingers and when rotated pulls the fingers apart and pulls the two shells together.

Abstract: A pleat filter arrangement and method of making the same wherein longitudinally extending sheets of filter media are pleated to include pliable strips adhesively extending between at least one face of the opposed pleat faces to separate the opposed pleat faces so as to allow fluid flow therethrough, the pleated filter media being cut to size as pleated filter medium units and framed.

Abstract: A filter apparatus for use in a forced air ventilation system, the filter apparatus having a first fan folded sheet of a washable first type of filter material, a second fan folded sheet of a second type of filter material, and fanfolds of the first and second fan folded sheets are substantially equally shaped and folded together such that the fanfolds of the first and second fan folded sheets are interdigitated to form a filter material assembly. The first type of filter material is preferably an electrostatically self-charging washable material such as woven polypropylene and the second type of filter material is preferably disposable and contains activated charcoal. The filter material assembly may be removably disposed in a rectangular filter frame for mounting the filter material assembly in the forced air system. The filter frame has at least one crank shaft rotatably disposed between two opposed side walls which are between an open front end and an open back end of the frame.

Abstract: A pleated filter and method of making the same wherein the crests of pleated filter medium include nesting daubs of pleat spreading and pleat maintaining material located at the crests to define free flow valleys between opposed pleat faces for efficient passage of a fluid stream to be treated therethrough from upstream through downstream pleat faces.

Abstract: An accordion filter insert has a frame formed about the filter material. The frame has an elastically deformable sealing lip on the periphery of the frame. The elastically deformable sealing lip is formed of the same material as the frame itself. The sealing lip and frame are formed as a unitary piece.

Abstract: A filter unit with a filter element receptacle and a filter element, where the filter element having a filter element box in which is inserted a filter pack or a filter medium. The filter element box has a filter element cover on which there is a peripheral projection which engages in a corresponding taper on the filter element box. In addition, the filter element can be inserted into the filter element receptacle which engages with a sealing effect in at least one corresponding packing groove of the filter element cover or box with at least one sealing web molded onto it.

Abstract: A gaseous cleaner element comprising a housing having a gas inlet and a gas outlet with a gas stream formed therebetween. An immobilized mass of sorption material formed in a desired shape is mounted in the housing, the gas stream passing therethrough. A particulate filter layer is mounted in the housing adjacent to the mass, the gas stream passing therethrough. The particulate filter layer is mounted upstream of the sorption material mass. The air cleaner element can be used as a replacement to existing filter elements to provide sorption and particulate filtering to air circulation systems such as cabin air filter systems.

Abstract: A filtering medium for air filters wherein its surface conditions have been improved, whereby the porous PTFE membrane is not damaged even after pleating, thus appropriately meeting needs for clean space in clean rooms. The filtering medium comprises a porous polytetrafluoroethylene membrane (2) and an air-permeable supporting member (1) which are laminated such that at least one of exposed surfaces comprises a surface of the air-permeable supporting member (1) having a maximum frictional resistance of 25 gf or less. This filtering medium can be obtained by, for example, press bonding the air-permeable supporting member (1) to the porous membrane (2) under heating and then pressing the surface of the air-permeable supporting member (1) to a silicone roll (4) for smoothing.

Abstract: An air duct has a filter mount opening originally intended to accept a shallow filter element for filtering air entering the duct. The opening has an interior flange whose original purpose was to support the shallow filter element. This flange has interior edges defining an air passage opening. The invention is implemented a filter unit including a frame and a deep filter element mounted in the frame. The frame has dimensions allowing the filter unit to replace the conventional shallow filter element with the frame inserted into the air passage opening and closely spaced to all of the interior edges. A resilient gasket is mounted adjacent to the opening's interior flange and projects slightly into the air passage opening so as to contact the deep filter element's frame. The gasket prevents air leakage between the interior flange's interior edges and the frame.

Abstract: A disposable air filter comprising a sheet of filter media, at least portions of the major surfaces of which are disposed to define parallel planes along those opposite major surfaces of the sheet intended to be placed normal to the direction of movement of air through the filter; and a frame.

Abstract: The present disclosure relates to systems and methods that use a hydrophobic medium to remove salt and moisture from the intake air of a gas turbine system. The disclosure also relates to systems and methods that use a two stage filtering process to remove particulate material, salt and moisture from the intake air of a gas turbine system. Particulate material is filtered from the intake air at a first stage air cleaner. Subsequently, salt and moisture are removed from the intake air at a second stage salt barrier located downstream from the first stage air cleaner. In certain embodiments, the second stage salt barrier uses a hydrophobic medium to remove salt and moisture from the intake air.

Abstract: A make-up air handler for supplying outside air to clean environments such as clean rooms in semiconductor fabrication facilities includes a flow passage through which the outside air is passed. At least one filter is disposed to filter the outside air passing through the flow passage. The make-up air handler preferably includes all boron-free filters to prevent the introduction of boron into the outside air by the filters. The make-up air handler can include boron-free ULPA filters to provide highly clean boron-free outside air for supplying to clean environments. The make-up air handler can be operated in a normal manner at air velocities exceeding the rated velocities of the ULPA filters, without subjecting the ULPA filters to air velocities exceeding their ratings, due to the configuration and arrangement of the ULPA filters in the flow passage.

Abstract: A filter assembly for use in filtering air in an air conditioning system has a front grille through which air enters the assembly and a rear grille through which filtered air is exited. A frame is attached to the grilles, joining these grilles together to form a container structure. An air permeable filter element in the form of a pleated or undulating sheet is installed in the container structure, the opposite ends of the pleated sheet being attached to opposing sides of the frame. The pleated sheet runs between the front and rear grilles and extends from the top to the bottom of the grilles. The filter sheet has a filtering media which may be of microglass on the surface thereof which faces the front grille and a stiffened backing on the surface facing the rear grille.

Abstract: A filter cartridge has a filter medium, which, on the circumferential side, is surrounded with clearance by a gasket-seal. A frame is arranged in the gap formed by the clearance, and is sealingly bonded to the edges of the filter medium and the gasket-seal.

Abstract: A filter insert which is insertable in a sealing manner into a filter housing includes an accordion fold pack whose end walls extend perpendicularly with respect to the longitudinal direction of the filter pack. Each of the end walls is surrounded in a sealing manner by a shape-stabilizing, clamp-shaped reinforcing element, each of the reinforcing elements being integrally formed in one piece with a gasket. The gasket is capable of being placed, in a sealing manner under elastic prestressing, against the adjacent housing wall of the filter housing.

Abstract: A pleat filter medium assembly wherein pleated fibrous filter medium forming troughs between opposed faces of adjacent filter medium pleats serve to include spacer inserts formed from intersecting sets of spaced strands of different cross-sectional thickness.

Abstract: An air filter device and an automobile having the same includes an air filter bent without disassembling a cowl to be simply and easily replaced within a narrow space, and the air filter is commonly utilized to both left-handed drive type and right-handed drive type automobiles. For this, an air filter member is formed with a creasing part throughout the overall portion thereof. A pair of frame members support the marginal edge of the air filter member, and a connecting frame member is integrally connected to the ends of the first frame member and second frame member to allow for bidirectional bending of the air filter member. Thus, the air filter is simply replaced without causing an interference with a frame mounted with a shock absorber. Also, the second frame member is upwardly bent at any time even though the up and down portions are reversed to have compatibility capable of being commonly employed into the left-handed drive type automobile and right-handed drive type automobile.

Abstract: Filter assemblies are disclosed that include a pleated web in which the pleats are connected to each other to provide support for the filter media during use. The interconnected pleats preferably form an array of openings facing the upstream side of the filter assembly when subjected to fluid pressure during use. In addition, the preferred filter media also includes an array of pockets located behind each of the points at which the pleats are connected. By connecting the pleats to form arrays of openings and pockets during use, the filter assemblies provide a structure that deforms in a predetermined, acceptable manner without the need for external support structure to support the pleats.

Abstract: A filter in a printing machine traps contaminants from a stream of air passing therethrough. The filter includes a support member defining an aperture therethrough for the passage of the stream of air. The support member has a cross section in a plane perpendicular to the flow of the stream of air. The cross section has an oblong shape and includes a longitudinal axis and a transverse axis. The filter further includes an air permeable member supported by the support member. The air permeable member defines a opening therein for receiving the stream of air. The filter further includes a reinforcement connected to the air permeable member. The reinforcement extends along the air permeable member in the direction of the stream of air. The reinforcement is positioned with respect to the support member so as to shape the air permeable member so that the opening may be sufficiently large to efficiently receive the stream of air.

Abstract: To provide a filter frame which enables a filtering medium to be easily renewed on a site and makes it possible to provide a filter at a low cost.The filter frame comprises a pair of frame elements capable of being integrally coupled together through flange bonding, each frame element comprising a passage portion allowing the passage of a fluid to be filtered and a flange portion outwardly disposed at a peripheral end portion of said passage portion, and that each of said flange portions has at least one bending portion, and said two flange portions, when coupled together, are engaged with each other based upon at least one tongue-in-groove connecting portion with said filtering medium being sandwiched between said flange portions.

Abstract: A re-usable frame support rack is provided for supporting and retaining an outstretched, replaceable pleated-media filter core. The pleated-media filter core is of a type that has fold lines extending in a transverse direction and that stretches-out/collapses in the longitudinal direction. The support rack has a frame formed of spaced longitudinal rails extending between spaced transverse rails. The frame carries a pressure-differential support system that provides support, in instances when a pressure differential exists across the frame, to the filter core on a low pressure side thereof. The transverse rails preferably include fingers or like gripping formations for releasably gripping the longitudinal margins of the installed filter core. The longitudinal rails include gates or flaps which have closed and open positions for allowing retention and unobstructed removal in the closed and open positions, respectively, of the longitudinal margins of the installed filter core.

Abstract: An air filter unit in which the generation of organic substances is restrained by controlling at least the amount of organic substances detected from a square test piece of 5.times.5 cm (25 cm.sup.2) of a filter medium so as to be 100 ng or less in the total amount of organic substances detected from the whole air filter unit at a temperature of 40.degree. C. before using. The air filter unit is assembled by housing a filter medium that has been bent in a waveform in a frame composed of 4 outer frame members and sealing the gap between the frame and the filter medium using a sealing compound. Organic substances adhering to the air filter unit are removed by blowing a cleaned air heated at 80.degree. C. against the air filter unit at a velocity of 50 ml/min for 60 minutes. Then, an air suction port and an air exhaust port of the air filter unit are sealed with a film (for example, a PET film) which keeps the unit from contacting with organic substances and from which organic substances are not generated.

Abstract: A filter cartridge has a frame made of tough material, which sealingly surrounds an accordion fold pack on its circumferential side. The frame is made of assemblable, plate-shaped frame elements and has, on the circumferential side along the lower and/or upper edge of the frame, a tongue, the tongue being insertable in a latticed holder having a U-shaped profile. A viscous joining compound is used to affix the tongue in place. The tongue is formed by strip-shaped tongue elements, each tongue element being joined to a frame element, wherein the adjacent ends of the tongue elements are sealingly fastened to each other by connecting corner pieces.

Abstract: An air handling unit that includes a main support member and front, rear and top covers mounted on said support that forms a housing for enclosing said unit. The covers have side walls that close over the support frame in abutting contact to form an interlocking seam therebetween at closure. Ribs are mounted upon the side walls of the support frame which bias the side walls of the covers outwardly to render the seam relatively air tight at closure. Two covers are securely affixed to the main support member while the other is removably attached to the main support member by a latching means. A HEPA filter is mounted in the main support member along with a blower system for drawing air through said housing.

Abstract: A gas liquid contact structure having a plurality of corrugated woven wire sheets alternated with rigid support members to separate and support the woven wire sheets. The vees or peaks of the corrugations are aligned and oriented in the same direction with the rigid support members separating and preventing the corrugations from nesting together.

Abstract: A filter apparatus for use in a forced air ventilation system, the filter apparatus having a first fan folded sheet of a washable first type of filter material, a second fan folded sheet of a second type of filter material, and fanfolds of the first and second fan folded sheets are substantially equally shaped and folded together such that the fanfolds of the first and second fan folded sheets are interdigitated to form a filter material assembly. The first type of filter material is preferably an electrostatically self-charging washable material such as woven polypropylene and the second type of filter material is preferably disposable and contains activated charcoal. The filter material assembly may be removably disposed in a rectangular filter frame for mounting the filter material assembly in the forced air system. The filter frame has at least one crank shaft rotatably deposed between two opposed side walls which are between an open front end and an open back end of the frame.

Abstract: A high-efficiency air filtering apparatus for cleaning and circulating air in a closed room is in the shape of a vertical cylinder and includes a semi-cylindrical housing and a semi-cylindrical filtering chamber, both enclosing a centrifugal blower configured to suck filtered air out of the apparatus through the filter and to blow it into the room. The apparatus is characterized by that the filtering chamber contains a closely pleated filter sheet of HEPA-filter which is covered on top and bottom by flat panels and is air-tightly pressed onto the semi-cylindrical housing, thus making the apparatus completely air tight. The filtering chamber is urged onto the contour of the filtering chamber and is releasably fastened to the top and bottom of the housing, permitting replacement of the filter after clogging.

Abstract: A filter assembly for use in an air purifier unit having a rectangular shaped air inlet entrance to the unit blower. A rectangular shaped frame containing a HEPA filter pack is slidably received within the blower inlet. An L-shaped flange surrounds the filter frame and closes against the air inlet of the blower to provide an air seal. The top wall of the flange is offset some distance from an adjacent wall of the frame to provide a handle for the filter assembly.

Abstract: An expandable filter cartridge for installation in the filter housing of a vehicle includes a rectangular frame having top and bottom legs and side legs. The side legs of the frame are extendible and retractable in length to configure the frame between a relatively compact size for insertion into the filter housing and a relatively expansive size for spanning the interior dimensions of the filter housing. The filter cartridge is installed by being inserted while in its compact configuration into a slot in the filter housing and, once inside, expanded to span the interior dimensions of the housing.

Abstract: The present invention relates to a flame retardant hot melt composition comprising from about 20% to about 60% by weight of the adhesive of at least one copolymer of ethylene, from about 10% to about 50% by weight of the adhesive of a flame retarding hydrated inorganic compound, from about 10% to about 30% by weight of at least one high melting point wax and from about 1% to about 10% by weight of at least one tackifying resin.

Abstract: A filter insert. The filter insert includes an accordion fold pack that is made of a filter material and is joined to a filter frame. The material of the filter frame is injected in a flowable state into the folds of the accordion fold pack which are open in the on-coming flow direction of the medium to be filtered. The material is subsequently hardened during automatic claw fixation with the fold walls. The entire peripheral edge of the accordion fold pack sealingly overlaps the outer boundary surfaces of the filter frame, and is designed as a sealing device.

Abstract: A radial air filter is pleated in the horizontal direction rather than the vertical direction so as to have increased capacity and efficiency with reduced air flow restriction. Preferably, the pleats have a parabolic cross section wherein the panels of the pleats form legs of parabolas with the legs being joined by arcuate peaks and valleys.

Abstract: A replaceable air filter system for milking machine pulsators has a base with an internal channel that communicates with the air inlet of a milking machine pulsator when the base is mounted on the pulsator. An air filter section is releasably mounted to the base and includes a case, air filter medium attached to the case, and a connector extending from the case which connects to an open bore of the base. The air filter section can be releasably secured to the base. The air filter medium may be formed of multi-fold filter material to provide a large area filter for the input air. When the filter medium is saturated or clogged, an operator can detach the air filter section from the base and replace it with a new air filter section quickly and conveniently.

Abstract: A filter cartridge having pleated filter material, the ends of which are joined together to form a conical tube. At least one band is bonded to the pleated filter material and extends at least partially around the circumference of the material in the area of each of its end sides. The band may be bonded to crease points of the filter material. A method of manufacturing the filter cartridge includes providing the initially strip-shaped, planar filter material with pleats. The pleated strip-shaped filter material is laid out forming an unwound cone-shaped shell. A band is placed onto the crease points of one side and is bonded to the crease points. Subsequently, the filter material is bent to form a conical tube, and the tube is closed upon itself by joining the two ends together.

Abstract: A frame supports a deep filter element to allow the filter element to be installed in a duct's conventional air intake opening as a replacement for a conventional shallow filter element. The frame has a flange to mate with a surface of the intake opening's interior flange. In one embodiment, two identical side panels are assembled with the relatively stiff end panels of a particular filter element to form the frame.

Abstract: A filter bag assembly and method and machinery to form the same wherein spaced opposed filter bag panels are connected together by transversely extending preselectively sized binder strips fastened selectively at opposed ends to the spaced filter panels to restrain outward inflation of the filter bag.

Abstract: An HVAC filter having a pleated paper filter and a plastic pre-filter, the filter and pre-filter are mounted in a parallel relation in the frame. The plastic pre-filter includes a plastic mesh having a plurality of openings, and an irregular surface on the inlet side to prevent matting of filtered material.

Abstract: An air cleaner provided with a bellows-like air cleaning filter includes an air permeable and pliable strip-like mesh element (3), a plurality of rectangular plastic frames (4) arrayed side by side with a predetermined pitch on one or both surfaces and along the full length of the mesh element (3), the plastic frames (4) being injection-molded and provided at both end portions in the width-wise direction with angled protrusions (5) having an approximately triangular cross-section and hinge portions (7) formed by thinning or linearly grooving a joint portion of the frames (4) between neighboring plastic frames (4). The bellows-like air cleaning filter is employed by transforming it into a cylindrical shape and fitting end caps (9) thereto.

Abstract: The invention concerns a gas filter unit or cartridge type, including a filter material put together to form one or several filter bags, and a support frame of essentially U-shaped cross-sectional configuration, including a web portion and two lateral leg members in adjoining relationship, the filter material closest to the mouths of the filter bags being clamped in position between said lateral leg members. In accordance with the invention, the frame includes profile sections of a flexible material, preferably a plastics material, at least one of said lateral leg members being hingedly interconnected with the web portion, in addition to which locking means are provided to retain the corresponding lateral leg member in its clamping position in which it is pivoted into engagement with the other lateral leg member.

Abstract: In an air filter assembly a non-metallic air filter media is clamped between a pair of opposed metal end flanges, one of which is mounted by a threaded mounting rod in alignment with an opening through a horizontal panel. A metal sleeve integral with one of the end flanges stiffens the assembly and prevents the filter media from collapsing. The air filter assembly is used with numerous similar air filter assemblies to filter inlet combustion air for large gas turbine engines.

Abstract: A filter insert (1A) for a fluid filter with an outer square or hollow cylindrical shape has a plurality of continuous zigzag folded walls (5) made of a fluid-permeable material (2) and provided in the plane of at least part of the folded walls with stiffening embossed depressions (3) and/or projections for keeping the walls folded. The depressions and/or projections of adjacent folded walls are interconnected at least in part and supported on each other. Stiff spacers are provided between the depressions or projections in at least part of their length for interconnecting them and supporting them on each other.

Abstract: A fluid filtration unit having pleated filter media with at least one ply, and two housing parts with inlet and outlet fluid passageways and inwardly projecting ribs that accommodate the pleated filter media.

Abstract: A filter includes a cylindrical filter element having a longitudinal axis, first and second end surfaces, and a plurality of longitudinal pleats. Each of the pleats has a pair of legs with first and second surfaces. The pleats are in a laid-over state in which the first surface of each leg is in intimate contact with the first surface of an adjoining leg and the second surface of each leg is in intimate contact with the second surface of an adjoining leg over substantially the entire height of each leg and over a continuous region extending for at least approximately 50% of the axial length of the filter element. An impervious end cap is connected to the first end surface of the filter element.

Abstract: A combined air cleaner and noise attenuating resonator device including a hollow cylindrical air cleaner element pressed to a fitting on a hose, the fitting latched to the housing in a position holding the air cleaner filter element within a cavity in a housing. An expansion chamber and a Helmholtz resonator chamber are both defined in part in the housing and by an insert piece within the housing which also forms an air flow passage in fluid communication with each chamber.

Abstract: A pleated, all poly(tetra-fluoro ethylene) filter element (20) incorporating a poly(tetra-fluoro ethylene) filter membrane (24) is shown and described. The membrane is supported by an all poly(tetra-fluoro ethylene) paper (26) and (28), which permits filtrate to pass through the paper and across the poly(tetrafluoro ethylene) membrane. A sandwich is formed by placing a layer of poly(tetra-fluoro ethylene) filter membrane (24) between the two layers of poly(tetra-fluoro ethylene) support paper, (26) and (28), and the sandwich is then pleated prior to assembly around a core (14) and between end caps (12) and (18), which are bonded to the poly(tetra-fluoro ethylene) paper and poly(tetrafluoro ethylene) filter membrane by a hot-melt process.

Abstract: A filter assembly having first and second opposite frame members and a filter element removably secured to the first and second frame members is provided. The filter element is preferably a pleated paper filter, positioned in extension between opposite end panels. An arrangement is provided for securing the end panels to, and in extension between, the first and second opposite frame members. When the arrangement is assembled, an outer frame comprising the two frame members in the two end panels is provided. In the assembly, the pleated filter fills the area within the frame. The filter media can be conveniently removed and replaced in the frame, as desired.

Abstract: This invention relates to improving the efficiency of air filter systems that incorporate adjustable air filter frames having telescoping frame sections. In such systems, an air bypass space exists between the frame and the filter frame support member in the air duct. This invention provides an air bypass clip that is inserted between the filter element contained in the adjustable air filter frame and the frame support member. The air bypass clip has a sealing lip which bears against the support member thus blocking the flow of bypass air between the adjustable frame and the support member.

Abstract: A regenerable gas filter cartridge for filtering particles from an exhaust gas includes a hollow tube having a perforated portion and an open end portion. The perforated portion has a diameter larger than the diameter of the open end portion. A filtering element is disposed on the hollow tube, and the filtering element extends over the larger diameter of the perforated portion and the smaller diameter of the open end portion.