Abstract: A filtering unit (10) has four filter holders (20) arranged in a rectangle around a blower (36). Each filter holder holds up to two filter elements (11). The blower draws air through the filter elements (11) and outputs filtered air through a vent (40). Refillable filter frames (16) are provided to allow the user to change the filter material (18). In one embodiment, glass chips are used as the filter material (18).

Abstract: A front panel mounting arrangement for a sheet filter in an air moving appliance including a frame, and when the sheet filter is in a mounted condition can be incorporated in the front panel from alternate directions, being the top and bottom of the panel, while the panel is capable of limited movement away from the frame and also capable of relative inclination with respect to the frame.

Abstract: A multiple stage filter assembly which combines a permanently framed particulate filter media layer with an odor and particulate removal filter media layer which is removably mounted to the particulate permanent filter frame in overlying relationship to the outer surface of the particulate layer. The odor removal filter media layer is held in position by a plurality of filter retaining members which cooperate with the main frame structure to provide support for the gaseous filter layer. The retaining members function in a manner which permits simple removal and replacement of the gaseous filter layer without disturbing the permanently framed particulate filter layer.

Abstract: A filtration unit comprising a filtration media subunit secured in an outer frame. The subunit comprises a fibrous filtration media enclosed in an inner frame having an upstream frame element and a downstream frame element. Each frame element has longitudinal and transverse struts and the intersection of these struts is in a single plane on the side of the frame elements which contact the filtration media. In one embodiment the filtration unit is enclosed in a sock of knit fabric; in another embodiment, there is a piece of knit fabric between the outer frame and the downstream frame element of the inner frame. The longitudinal struts may have portions which are perpendicular to and project beyond the principal plane of the periphery of the downstream frame element. If such perpendicularly projecting portions are provided, they are preferably arcuate in configuration.

Abstract: An air return filter grille assembly having a perforated faceplate hingedly attached to a molded fiberglass plenum. The molded fiberglass plenum has a performed recess for reclining and positioning a filter resting on the faceplate. An abutment and leaf spring on the faceplate hold the filter firmly in the recess. The air filter grille assembly is constructed to mount easily on T-bar suspended ceilings with the perforated faceplate held closed by manually rotatable pawls. Another reason for the spring is to keep the filter in position as the unit cycles on and off, thus preventing the accumulated dust and dirt on the filter from staking down or dusting back into the room.

Abstract: An air filter assembly (1) includes an outer casing (6) having end, rear and downstream portions which are generally planular and thus easily settable on the floor during installation, with the downstream portion being mountable flush to a furnace (3) or the like. An inner filter-holding drawer (7) is provided for easy insertion and removal from the open front casing portion. At least one end wall (10, 11) of the casing is provided with a springable latch (34) adjacent the casing front opening and which snappingly engages and holds a cover (9)in place when the drawer is within the casing. The drawer end walls (44, 45) include external grooves (52) which slide over rails (56) correspondingly mounted internally of the casing side walls. The tolerances are such that the grooves are wider than the rails.

Abstract: A composite stove hood filter consists of a primary metal mesh filter and a nonwoven, secondary disposable filter. The secondary filter is a low basis weight (0.2 oz./yd..sup.2 to 1.0 oz./yd..sup.2) spun-bonded polymer sheet which is attached to the primary filter by means of elastic bands or Velcro strips. A patch of melt-blown polymer material, impregnated with air freshener, may be attached to the spun-bonded sheet of the secondary filter to freshen the air as it is filtered.

Abstract: A high efficiency particulate air filter, and a method of fabricating the same, are disclosed, with the filter being characterized by being lightweight and readily disposable after use. Further, the filter may be fabricated in a basic or universal form, which permits it to be utilized to form any one of a number of possible specific mounting configurations by the placement of one or more specifically designed headers about the outer periphery. The filter comprises a sheet of HEPA filtering media folded upon itself in accordion fashion to form a filter pack, and a relatively thin and lightweight peripheral frame surrounding and supporting the pack. The frame is composed of a relatively hard, crust-like, air impermeable molded material which is self-bonded and sealed to the filter pack to effectively preclude the leakage of air therebetween.

Abstract: A filter apparatus is disclosed for removing contaminants directly from paper handling machines in data processing rooms. Such contaminants include paper dust and carbon black from high speed paper handling machines such as computer printers, paper cutters and the like. The apparatus comprises a wheeled housing having a top cover with an outlet grille. A squirrel cage fan is suspended from the cover beneath the grille. A filter pack is mounted beneath the fan. The bottom of the housing has an inlet opening connected to a duct which passes air from the machine being serviced, through the filter pack and out the grille.A vacuum motor is mounted in the bottom of the housing and connected to a flexible hose for picking up material on the floor as well as spillage from inside the data processing machines. This material is passed through an in-line filter. The air from both the duct and the flexible hose is passed through the filter pack.

Abstract: A filtration unit comprising a filtration media sub-unit secured in an outer frame. The sub-unit comprises a fibrous filtration media enclosed in an inner frame having an upstream frame element and a downstream frame element. Each frame element has longitudinal and transverse struts and the intersections of these struts are in a single plane on the side of the frame elements which contact the filtration media. In one embodiment the filtration unit is enclosed in a sock of knit fabric; in another embodiment, there is a piece of knit fabric between the outer frame and the downstream frame element of the inner frame. The longitudinal struts may have portions which are perpendicular to and project beyond the principal plane of the periphery of the downstream frame element. If such perpendicularly projecting portions are provided, they are preferably arcuate in configuration.

Abstract: The specification discloses a filter stack in which a plurality of individual tapered frames with openings on their widest sides are alternatively aligned, with filter paper between adjacent frames, such that the openings in one frame face one way and those in the next adjacent frame face the other way. Parallel tongues projecting from one surface of the frames insure that filter paper will be clamped in place. Air leaks are eliminated by shrink-wrapping said stack of frames, except on the ends with openings, to firmly hold them together.

Abstract: A filter assembly includes a casing having a support panel to support the filter element and upstanding walls extending around the periphery of the casing. The corners between the walls are reinforced by a pair of tabs extending, each extending from a respective one of the walls and co-operating with the other wall to provide a double layer of reinforcement. The walls are inclined to the support panel to permit nesting of the casings during transport.

Abstract: A carburetor chamber cover device for covering a carburetor chamber of a portable power-driven machine such as a chain saw. The carburetor chamber accommodates an air cleaner and a carburetor for supplying air-fuel mixture to an internal combustion engine. The cover device comprises a cover adapted to close the opening of the carburetor chamber and having an aperture, and a filter plate and a blind plate adapted to be selectively attached to the cover so as to fit the aperture. The filter plate has a screen capable of arresting comparatively large particles of dust. In order to avoid troubles such as blocking of the filter plate by snow or icing of the carburetor, the filter plate is detached and the blind plate is attached instead.

Abstract: The disclosure describes an electrical purification system for purifying a gas and which comprises a housing having an inlet and an outlet and defining a gas flow path between the inlet and the outlet, an electric blower means mounted to the housing for effecting a flow of gas along the gas flow path, and a self-contained filtering means operatively associated with the housing to communicate with the flow of gas. The blower means includes a stator and a rotor magnetically coupled to each other and further includes a blade means connected to the rotor and disposed within the housing in the gas flow path for forcing the gas along the gas flow path.

Abstract: A filter (2) for a ductless range hood includes a layer (8) providing an impact barrier for removing coarse particles such as grease spatters from cooking discharges and resisting the heat of incoming discharges, for preserving filtering capacity and service life of downstream layers, a second layer (10) providing absorption of grease remaining in the cooking discharge after passage through the first layer, a third layer (12) for removing noxious gases such as oxides of nitrogen and carbon monoxide from the cooking discharges and for absorbing odors, and a fourth layer (14) for removing fine particles such as smoke from the cooking discharges. Various combinations of layers are disclosed as well as various structural and framing configurations.

Abstract: A filter media contained in a rectangular frame rests on and covers the opening of an overhead rectangular support frame, preferably constructed out of metal channel bars with a resilient seal between the filter frame and the support frame and a spring loaded clamp for adjustably and releasably holding the filter frame snugly against the support frame.

Abstract: High efficiency air filters, including cores of pleated media sealed within a metal frame, are supported by parallel tracks suspended from overhead structure of an enclosed room. The filters are arranged both side-by-side and end-to-end in closely adjacent relation to present an essentially continuous, downwardly facing surface forming all or part of the overhead boundary of a space wherein downward, laminar air flow is provided. The filter units are sealed to one another, or to the adjacent walls, continuously around the periphery at the lower ends by caulking material which is injected from below into the spaces between the units to provide a totally sealed system, whereby the only path for air to enter the room is from above through the high efficiency filter media.

Abstract: A high efficiency particulate air filter is disclosed which comprises a frame surrounding and sealably supporting the filter pack, with the frame composed of four separate side panels which are rigidly interconnected at their abutting ends by means of corner plates. The corner plates are in the form of two flanges disposed at right angles to each other, and the flanges are closely received within slots formed on the outer face of the side panels. The corner plates preferably extend across the entire width of the side panels of the frame to impart substantial rigidity to the frame, and a sealing material is disposed in a recess which extends along the bight of the corner plates to provide a continuous seal along the abutting ends of the side panels.

Abstract: A deodorizing fitting is provided for an air filter used in air circulation ducting of a domestic dwelling or other building for deodorizing the circulating air. The fitting comprises a rectangular envelope of perforated cardboard with a deodorizing insert therein and adhesive-backed tabs on adjacent edges of the envelope for securing same in the corner of the filter.

Abstract: A frame is made from a one-piece paperboard blank which is formed in a collapsed shipment and storage blank configuration. The collapsed frame can be manually expanded for use. The corners of the expanded frame are locked by locking tabs and locking slots which hold the frame in its expanded state. The frame can be used to hold air filters which are used to filter the air entering a hot air furnace.

Abstract: An invertible corner connecting clip is disclosed having an out-corner unit and an in-corner unit connected together in spaced parallel right angle relation to define pockets for receiving side walls of main and cross support members of a ceiling latticework. The out-corner unit has upper and lower horizontally extending relieved areas to enable the clip to be inverted and used to complete either a right or left-hand corner and a tactile indicator to identify proper orientation of the clip for installation.

Abstract: An air cleaner including a casing, a filter element and a holding plate assembly having a grid-like portion, wherein a plurality of engaging portions are formed at the casing and a plurality of other engaging portions are formed at the holding plate assembly for engagement with each other. One of the engaging portions of the casing is located at one side thereof and the other engaging portion thereof is located at a side thereof opposite the one side, and one of the engaging portions of the holding plate assembly is located at one side thereof and the other engaging portion thereof is located at a side thereof opposite the one side thereof. The engaging portions located at one side of the casing and the holding plate assembly are displaced vertically from the engaging portions located at the other side.

Abstract: An air filtering system of the type used in clean rooms and the like supportable from a ceiling. The unit includes a supporting frame with an opening therethrough, the supporting frame being suspended from the ceiling by cables or the like. A filter having a filter frame therearound is placed within and across the opening in the support frame. A cutting wire is positioned between the supporting frame and the filter frame around the periphery of the opening. One end of the wire is free and extends below the two frames. The other end is fixedly secured to either the filter or support frame. A cuttable seal is applied between the filter and support frames around the periphery of the opening. Clips are also provided to hold the filter within the opening. When one wishes to remove the filter, the free end of the cutting wire is pulled, cutting the seal around the periphery of the opening, thereby allowing the filter and filter frame to be removed from the support frame opening.

Abstract: A reusable air filter system for providing permanent, self-charging, electrostatic filter stages that are easily cleanable for re-use. The filter system may be used on air conditioners, furnaces, and grease hoods. A frame is circumscribed about the edges of a plurality of polypropylene filter elements. At least one stage of the filter is three dimensional in shape and folded over on itself to retain its filtering characteristics and to provide a dual biasing device for use with the filter stages upstream of the three dimensional filter. The folded three dimensional filter is not creased, thus providing an additional biasing element in the filter system.

Abstract: A latticework adapted for suspension from the ceiling and forming a double channel configuration of cross members carrying a sealant for sealing the filters supported thereon.

Abstract: In known air filter assemblies, a mechanism provided for vacuum cleaning of the filter has been located entirely on the upstream side of the filter. In the present filter assembly the vacuum head is mounted on a carriage which is located on the upstream side of the frame which supports the filter and a major portion of the drive mechanism which drives the carriage relative to the filter frame is located on the downstream side of the filter frame. This arrangement serves to reduce the likelihood of contamination of the drive mechanism.

Abstract: A support and holding frame for supporting an air filtering element of the type that is of the nonself-supporting type. The invention comprises a frame adapted to hold the filtering element and consists of a three-sided sheet metal box having its upper and lower surfaces provided with bent edges directed toward the inside of the box to serve as flange supports for the filtering element. A pivotal door is provided on one side to permit simple access for insertion and removal of the filtering element.

Abstract: This invention provides an improved construction for air filters wherein the filter frame is provided with indentations or recesses adjacent to its opposite corners which allow a plurality of filters to nest together in a laterally offset relationship to conserve space. The invention can be employed with an air filter including a filter element of fibrous material and a frame for supporting the filter element at its marginal edges. A set of recesses is formed in the same face of the filter frame and located along adjacent sides of the frame at positions adjacent to its opposite corners. The recesses are spaced from diagonally opposite corners of the filter frame by substantially the same distance to permit a pair of filters to nest together in a laterally offset relationship for shipment or storage.

Abstract: Bracelet-shaped filter device molded of plastic has a frame surrounding a slotted filter portion and integral retaining portions which permit it to be held tightly in contact with the surface of a pipe. The filter portion contains a plurality of evenly spaced slots which are positioned so as to be spaced at a predetermined distance from an aperture in the pipe through which fluid may pass. The filter slots are V-shaped and of increasing width in a direction toward the center of the pipe. In a preferred embodiment, the retaining portions are integral straps which can be tightened and held by an integral fastener. In a modified structure which is suitable for small tubes, the device may include curved portions which are adapted to be spread apart and snapped over the sides of the tube. The devices are especially useful to prevent entry of the solid particles in a fluidized bed into the fluid supply conduit.

Abstract: An evaporative cooler pad assembly comprising a pad of absorbent material, e.g. woodwool is retained between a pair of side grids each of which has projections which interengage the other, and at least some of the projections extend through the pad and support it.

Abstract: A filter module comprises a frame bridged by a plurality of spaced-apart arch members, on which is supported a one-piece filter element comprising a plurality of pockets which each enshroud an arch member, and which connect into a mouth portion circumscribing the frame and held in position by a drawstring. The filter module is easily erected, and a seal between the inlet and outlet sides of filter equipment employing the module is easily provided.

Abstract: A filter system particularly adapted to remove particulate aerosol and vapor contamination from air comprising, an outer shell having a contaminated air inlet cap connected to one end and a clean air outlet cap connected to the other end, and a plurality of filter units mounted axially in the shell, each of said units comprising two containers, one of the containers having a particle/aerosol filter element therein such as paper, and the other of the containers having a vapor filter element therein, such as charcoal, the two containers of each filter unit being positioned in contiguous relation. A vapor passage is provided from one container to the other container of each unit and an annulus is provided between the outer periphery of the containers and the inner surface of the shell.

Abstract: Disclosed are filters which are particularly useful in sampling devices for detecting radioactive particulate contaminants in a gaseous medium, such as air. The filters comprise a filter membrane sandwiched between two pieces of plastic material having holes exposing the filter membrane to the gaseous medium. The filters can readily be handled by grasping them by their plastic portions and there is little risk of the filter medium being damaged. An air tight seal may easily be made with the plastic surrounding the filter medium. The filter is easily constructed by placing a piece of filter material to cover a hole in a plastic base layer and then covering them both with a plastic cover layer having a hole to match the hole in the base layer. The cover layer is preferably formed of self-adhesive layer.

Abstract: This invention provides an improved construction for air filters wherein the filter frame is provided with indentations or recesses adjacent to its opposite corners which allow a plurality of filters to nest together in a laterally offset relationship to conserve space. The invention can be employed with an air filter including a filter element of fibrous material and a frame for supporting the filter element at its marginal edges. Preferably, a set of recesses is formed in the filter frame at positions adjacent to its diagonally opposite corners. Each recess is adapted to receive the frame of another air filter to permit the filters to nest together in a laterally offset relationship for shipment or storage. The air filters are arranged in a stack with alternate filters in the stack diagonally displaced relative to the remaining air filters. The recesses permit each air filter to be nested with one or both of its neighbors.

Abstract: A filter cartridge for filtering fluid, such as air, within an enclosed housing, such as a disk drive, comprises a toroidal body having a pair of mating confronting halves fastened together. A pair of annular sheets of filter media are sandwiched between the halves and are separated by a ring member to engage each sheet of filter material against a respective one of the confronting halves. Fluid to be filtered flows radially through the cartridge to flow through at least two portions of the filter media. Optionally, a third sheet of filter material may be supported by the ring member to provide additional filtering.

Abstract: A filter device used to filter medical anesthesia gases and other inhalable respiratory gases. The filter device has a ported housing, and a filter member within the housing. The filter member is a porous sheet that is transversely pleated and draped to define a peripheral foot of such porous sheet. The peripheral foot is sealed along its entire periphery to the housing. Two sets of intermeshing hangers are provided with both sets of the hangers being anchored to the housing and distortingly maintaining the porous sheet in such a pleated condition.

Abstract: An air filter assembly is provided which comprises a compressible air pervious multi-sided filter panel and a frame therefor, the latter being adjustable from a collapsed first mode to an operative second mode. The frame of foldable sheet material includes a foraminous center section in supporting engagement with the filter panel; a marginal section delimiting the center section; and a plurality of elongated peripheral sections arranged in alternate pairs and foldably connected to an coacting with the marginal section and with each other to form a hollow verge encompassing the filter panel periphery when the frame is in the second mode. The peripheral sections form a substantially flat multiply flange overlapping and compressing the filter panel periphery when the frame is in the first mode. A first pair of alternate peripheral sections have the opposite end portions thereof overlying corresponding end portions of a second pair of alternate peripheral sections when the frame is in the first mode.

Abstract: A filter assembly in an air cleaner includes a lower wire-form adapted to receive two opposite ends of a pliable filter material. Spaced wires on the lower wire-form enable manual forming of pleats in the filter material and define the tops of such pleats. A complementary upper wire-form is engageable with the lower wire-form and attached filter to define the bottoms of such pleats.

Abstract: A filter assembly for clean air installations includes a block of high efficiency particulate air (HEPA) filter material adhesively bonded and sealed within an imperforate rigid thin-walled side frame which extends axially beyond the inlet surface of the filter block and thus provides an integral plenum chamber volume as part of a self-contained filter subassembly. The side frame has peripheral cover and supporting flanges at its inlet and outlet ends and can thus be conveniently assembled with and removed from a reusable cover member and cover gasket for the plenum chamber and a reusable perforated outlet grill and one or more peripheral outlet sealing gaskets, all of which constitute parts of a complete filter assembly which can be readily supported by a standard or special ceiling or wall grid or frame assembly.

Abstract: A dual filter system for heaters and airconditioners comprising releaseably securable throwaway secondary filter secured to a disposeable or permanent primary filter.

Abstract: A filter assembly for use especially with air conditioning and heating ducts, comprising first and second rectangular frames, the latter frame being detachably positioned in the first one, and a filter element sandwiched between the rear end of the second frame and a flange seat on the first frame. Interiorly separable snap lock elements on the first and second frames serve to retain the latter frame and filter element in position in the first frame. The second frame is formed into a louver or grill and includes a plurality of horizontally-spaced and inclined slats, the spacing being so as to permit ample flow of air through the assembly, the slats serving as a handle for the insertion and withdrawal of the second frame relative to the first one.

Abstract: An improved air filter panel of the type having a fibrous filter batt and a circumferential support frame surrounding the batt, the frame having an axially extending frame element, the frame element being folded transversely to form frame sidewalls, the sides of the batt being connected to the sidewalls of the frame, the ends of the folded frame element being fastened together to secure the batt in place within the surrounding sidewalls, the improvement comprising an improved frame end fastening means, the means comprising a tab connected at a fixed end thereof to the sidewall of the support frame adjacent one end of the frame element, the tab having a neck portion at the fixed end and a head portion adjacent a free end thereof, the head portion being connected along a portion of a following edge thereof to the neck portion, the remaining unconnected portion of the following edge providing a flange portion, and a slot in the sidewall adjacent the end of the frame element opposing the tabbed end, the slot bein

Abstract: A main casing 34 contains a centrifugal fan 10, a filter unit 12 upstream, and a duct 14 downstream for guiding air to a face mask. There is a center plate 36 to which a motor 18, the fan 10, a battery 20 etc. are secured. A back plate 32 is removable to provide access to the electrical components. The filter unit 12 is held in position by an apertured cap 24.

Abstract: A filter for removing airborne grease has spaced front and rear walls each with a series of transverse louvers extending into the interior of the filter and opening downwardly. A filter media of expanded metal sheets is sandwiched between the front and rear walls.

Abstract: An air filter assembly including a molded rectangular frame. The frame includes a filter element supporting and backing portion and an integral peripheral flange portion. The filter element supporting and backing portion is generally planar and is formed with a multitude of discrete circular apertures arranged in a pattern to permit air flow therethrough. The flange portion has a channel shaped cross section defined by inner, outer and connecting walls. The inner and outer walls slope towards each other to permit one rectangular frame to be nested inside another. The outer wall of the flange is shorter than the inner wall and legs are formed as part of the outer wall with the legs being longer than the outer wall but somewhat shorter than the inner wall. The frame is preferably molded from reprocessed paper pulp. The frame is bowed a slight amount longitudinally in the direction of normal air flow through the filter element.

Abstract: A gas filter comprising a square frame and an interchangeable filter package containing a filter web of a folded zig-zag configuration forming a plurality of proximate filter pockets received on a support grid mounted on the frame and having a shape complementary to the folds of the filter web.

Abstract: An attachable and detachable filter for use with an ostomy bag includes a plastics housing member having two sections hinged together by an integral hinge and each section has a peripheral wall. One section has at least one aperture in the wall and the other section carries a sharp-pointed resilient-headed generally cylindrical stud which is a push fit through the aperture in the other to clamp the two sections together. There is a layer of gas filtering material within one or both of the housing sections.

Abstract: A high efficiency air filter having a channel formed in the front peripheral surface thereof which is substantially filled with a fluid of high consistency and which is adapted to effect sealing engagement with a mating retaining flange mounted in the housing. A pair of resilient wiper lips extend across the top of the channel from opposite sides thereof to thereby contact the sides of the retaining flange while the filter is assembled in the housing, and then wipe both sides of the flange during withdrawal of the filter from the housing to thereby retain substantially all of the fluid within the channel and prevent the build-up of possibly contaminated fluid on the retaining flange.

Abstract: High efficiency air filters are fabricated by forming two end assemblies from rectangular wall members with side plates attached to extend upwardly from opposite sides thereof. A removable wall of expendable material such as ordinary masking tape is applied to the other two sides, extending between the ends of the side plates to form a shallow pan which is filled with a liquid adhesive. The pleated filter media is attached along its two side edges to side wall members having notched ends for mating with the side plates of the end assemblies. One edge of the filter media between the two side walls is immersed in the pool of adhesive and the side walls are attached to the side plates. After the adhesive hardens, the masking tape is removed and the other end assembly is attached in the same manner.

Abstract: Generally rectangular paperboard frame blanks are fed separately into a horizontal position from a stack at one end of a first leg portion of an L-shaped assembly line, and air filter mats are fed respectively to the frame blanks. Each edge portion of a frame blank is scored to provide three spaced parallel fold lines. As each frame blank with an air filter mat is conveyed along the assembly line, glue is applied along two spaced parallel glue lines on each of a first pair of opposite edge portions and the edge portions are doubly folded. Then the blank and mat are shifted at right angles and conveyed along the second leg portion of the L-shaped assembly line where the gluing and folding operations are repeated for the second pair of opposite edge portions.