Abstract: A filtered cold air return register particularly for base board units which provides for a removable replacement filter section in combination with the normally provided duct covering or end section. The unit provides a filter device for the return air prior to its recycling by the furnace or air conditioning fan.

Abstract: The invention concerns a filter system having a plurality of individual removable filter units disposed between inlet and outlet ducts for a gas flow path to filter the gas flow. The system comprises one or more filter ports between the inlet duct (3,5) and the outlet duct (4,6) to receive removable filter units (1), a transfer port (25) co-operable with and sealable by a flask (20) for the filter units, a seal plate (14) removably located in the transfer port, means (15) for removing the seal plate, a carriage (18) movable between the transfer port and the filter port or ports, means (15) for placing filter units on or removing filter units from the carriage adjacent to the transfer port and means (8) for placing filter units on or removing filter units from the carriage adjacent to the filter port or ports. The system may be used to filter from a gas flow harmful or potentially harmful substances, e.g. particles which are radioactive, toxic or biologically active.

Abstract: An air intake filter for internal combustion engines has a flat, replaceable filter insert 20, through which the air flows transversely in operation, and which has a gasket 22 disposed on the periphery for sealing at the face side against a ledge 15 of the filter housing 11. The insert can be inserted into the filter housing through a narrow side, the sealing pressure being produced by a cover 50 which has two sliding wedges 51 and 53. To bring it about that, when the sealing pressure is applied, the gasket 22 will not be shifted laterally with respect to the ledge 15 of the filter housing 11, the cover, which is in the form of a substantially open frame, replaceably accommodates the filter insert. The cover is provided with cams 40 and 41 which serve to fix the frame 30 in an extended position during the replacement of the filter insert.

Abstract: In a filter insert which is received exchangeably in a shaft along a channel and which can be fixed sealingly relative to frame shaped shaft walls via at least one gasket preferably continuous on a flow-off side of the filter, it becomes possible to change the filter easily, without the danger of damaging the gasket, if there is at least one pressing element which can be connected to a pressure reducing device. When the pressing element is in the contracted pressure reduced position, a continuous gap forms between the gasket and associated shaft wall during a shift of the filter, this gap being cancelled when the pressure reducing device is disconnected.

Abstract: Apparatus for filtering dust and the like entrained in a flow of transport air which includes an enclosed housing having an upper filtering portion and a lower hopper for collecting dust. A plurality of filter elements are disposed in the upper housing portion, and a specially formed inlet plenum directs the transport air with entrained foreign particles in a predetermined direction toward the hopper so that heavier particles of dust are carried directly to the hopper by inertia rather than collecting on the filter elements. The filter elements are support solely by a cluster of support rods extending across the housing, and an access opening and closure door are provided for inserting and removing the filter elements. A latch assembly is provided which slidably engages the enclosure door at its closed position, after which it can be tightened, all without requiring any special tools.

Abstract: An air intake filter for internal combustion engines has a flat, replaceable filter insert through which air passes transversely in operation, and which can be inserted from one side into a filter housing. The filter insert has a gasket arranged on its periphery for sealing an end face of the filter insert against a lip on the filter housing. Sealing pressure is exerted by ledges on lateral portions of the filter housing which slant toward the filter insert in the direction of insertion. To prevent the gasket from being displaced laterally with respect to the lip on the filter housing when the sealing pressure is applied, the filter insert is received in a substantially open-faced frame.

Abstract: A vacuum cleaner assembly including a multiplicity of vacuum cleaner canister units each of which has a filter for receiving dirty fluid sucked into the canister unit and is configured such that two suction forces operate on each canister unit, with one suction force pulling fluid onto the filter and being of greater force than the second suction force pulling fluid away from the filter and pulling it out of the canister unit to an adjacent canister unit, the filter in each canister unit located in a removable compartment which can be removed when the compartment is filled with dirt, and valve means to turn off the flow into a canister unit after its compartment has been filled with dirt while permitting the vacuum cleaner to continue running and directing the flow of dirty fluid to adjacent cannister units with uninterrupted and undiminished suction power.

Abstract: An air delievery monitoring system covers an aperture of an air duct with an insert having a bore. A filter element in communication with the inside of that air duct through that bore is made accessible from outside of that duct. Air escapes from the duct through the bore in the insert to the filter element which traps contaminants in such air for subsequent laboratory analysis. The filter element is preferably encapsulated in an apertured filter element housing which is mounted in the insert in communication with its bore. After removal of that housing from the insert, the contaminated filter element can be transported or sent to the laboratory for the performance of several analyses thereon.

Abstract: The filter comprises a body (10) defining a chamber (101) to which access is had through an opening (102) closed by a cover (103). The chamber is adapted to receive a filtering cartridge (20). The body (10) is made in two semi-shells (110, 120) which are united in a junction plane (100) extending across the chamber (101), the opening (102) for the passage of the filtering cartridge (20) being astride the junction plane (100). A positioning device (30) for the filtering cartridge is carried by the body (10) to permit the insertion or the removal of the cartridge (20) by a movement in translation in a direction substantially parallel to the junction plane (100) and the positioning and the retraction of the cartridge by a displacement in a direction substantially perpendicular to the junction plane (100). Application in automotive vehicle engines.

Abstract: A filter device having a plurality of filter elements and at least one flexible joint connecting the filter elements to each other. The filter elements are made of a substantially inflexible material and have connecting surfaces in parallel with a direction of air flowing through a passage in which the filter device is provided. One end of the flexible joint is connected to the connecting surface of one of the filter elements, and the other end of the flexible joint is connected to the connecting surface of the filter element adjacent thereto.

Abstract: A portable room air filter includes a cabinet with an open bottom. A blower mounted atop a filter chamber is located at the bottom of the cabinet. The filter chamber receives one or more air filter modules. The air filter modules may include a filter media layer having opposed major surfaces and baffle members for directing air flow generally parallel to the major surfaces.

Abstract: An easily manipulable camming mechanism is disposed within a cavity designed to hold a standard nuclear biological filter within an environmentally sealed military vehicle. The camming mechanism utilizes a cammed actuator to transfer a motive force to a spring which urges a piston to engage or disengage an inlet or an outlet of the filter. The spring ensures that seals on the filter are compressed to the proper force and absorbs excessive torque which might damage the filter or the mechanism.

Abstract: Polymer filtration apparatus comprising a body having a pair of upstream passages each terminating at a slide channel and a pair of downstream passages respectively opposing the upstream passages, and a slide member in the channel having apertures for a pair of replaceable filters each normally communicating between an upstream passage and a downstream passage. The extents of the channel surfaces between the pairs of passages and between each passage and the exterior of the body, and the extents of the filter apertures on the slide member are related so that one filter remains active when the slide member is in position for replacing the other filter. After a filter has been replaced the new filter may be prefiled without pressure loss in the polymer or excessive leakage thereof.

Abstract: A filter system for a hot cell comprises a housing adapted for input of air or other gas to be filtered, flow of the air through a filter element, and exit of filtered air. The housing is tapered at the top to make it easy to insert a filter cartridge using an overhead crane. The filter cartridge holds the filter element while the air or other gas is passed through the filter element. Captive bolts in trunnion nuts are readily operated by electromechanical manipulators operating power wrenches to secure and release the filter cartridge. The filter cartridge is adapted to make it easy to change a filter element by using a master-slave manipulator at a shielded window station.

Abstract: An air filter assembly for the air intake system of an internal combustion engine includes a housing which receives a removable, replaceable filter cartridge. The lower end of the filter housing includes a hub assembly which defines the outlet opening from the housing. A removable, replaceable bridge assembly extends into the housing from the outlet opening and provides an axial support for the filter cartridge. The bridge and hub assembly are provided with cooperating releasable retaining mechanism comprising a rib projecting into the outlet opening which engages a circumferentially extending ring on the bridge assembly to prevent the bridge assembly from being pulled into the housing. The bridge is also provided with deflectable arms which also engage the rib to prevent the bridge from being pushed out of the housing unless the arms are deflected when the bridge is to be withdrawn from the housing.

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 deodorizer is constructed of a casing defining an intake opening and a discharge opening, a blower provided in opposition to the intake opening, a filter provided in the flow passage of an air stream to be produced by the blower, and a reservoir for storing an odor-absorbing liquid therein. The blower, filter, and reservoir are all housed within the casing.

Abstract: An automatic clothes dryer includes a lint screen mounted within a lint screen assembly to filter lint entrained in an air flow stream during the drying operation. The lint screen assembly includes a shaped housing spaced close to the peripheral edges of the screen's lint collecting surface, yet spaced further from the screen's midportion to enable quantities of lint to accumulate on the screen and still be removed from the dryer without the risk of the lint falling from the lint screen. The lint screen assembly is held within the dryer only by a pair of fastening screws.

Abstract: A dry solids separator is described for removing powdery materials from a gas stream without a substantial overall pressure drop as said stream passes through the separator. The separator consists of a plurality of mutually spaced baffle plates disposed as at an angle to the inlet of the separator. Each plate consists of a plurality of mutually spaced channel shaped baffles opening into the gas stream and defining between adjacent baffles vertical slit nozzles. The channel shaped nozzles are also staggered so that the next adjacent downstream baffle will be behind an upstream nozzle.

Abstract: An in-line after-air filter is disclosed for optimal filtration of a maximum volume of air flowing to the engine. A multiple filter system comprising discrete abutting reticulated foam filter elements of different porosity impregnated with a petroleum-based agent trap air contaminants as the air flows from the primary filter to the engine manifold. An air expansion coupling, flared air inlet port and an air diffuser allow maximum air flow through the filter elements. A retainer plate having numerous six-sided openings allows a maximum volume of air to flow through the outlet port and the air funneler coupling to the engine manifold.

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 chemical filter for attachment into an inlet housing of a tractor cab ventilation system includes a rectangular housing with a surrounding flange co-planar with one end face so that the flange can be clamped between an abutment face surrounding the inlet opening and a dust filter conventional on the system. One end wall of the housing can be opened for insertion of a particulate absorption material for example activated charcoal.

Abstract: An air filter system, with a replaceable cartridge, suitable for use in controlled environment systems such as computer information storage and retrieval devices. The system provides ease of maintenance, while providing a highly sanitized air stream to an optical device, over prolonged periods of operation, for temperature control of temperature sensitive areas. The system is comprised of a housing plenum located in the controlled environment system, the housing having a sliding filter tray, a plurality of air flow ports and a spring biased valve gate. When the filter tray is fully inserted in the housing, the valve gate is forced open so that the air flow is into the controlled environment, but when fully retracted the valve gate closes, causing the air to exit the system through an exhaust port.

Abstract: An air distribution system for a vehicle cab is disclosed herein. Fresh air is drawn into the system, filtered and transferred to the interior of the vehicle cab. The system uses a blower for transferring air into the cab with all fresh air passing first through a fresh air filter. The fresh air filter has air flow from a hollow interior out through air permeable sides. This air flow traps particulates within the interior of the filter which is then easily removed from an air filter chamber without emptying dirt into the chamber or on the operator. Furthermore during operation, accumulated dust and dirt is kept within the filter and does not drop off on or around the cab. This system may be used for simple ventilation or may be combined with other air conditioning and air recirculation means thereby providing a total vehicle ventilation system.

Abstract: A compact device is provided for sampling particles from the exhaust gases of an internal combustion engine for an automotive vehicle. The device includes a dilution tunnel, to which is supplied all the exhaust gases of the internal combustion engine. From the dilution tunnel, by way of an exhaust gas distributor, a sample stream of exhaust gas is distributed to filter cylinders arranged in exhaust gas conduits in dependence on the operation of the internal combustion engine. Filter units, traversed by the sample stream of exhaust gas, are removably disposed in the filter cylinders which are vertically arranged and exhibit a filter mounting element accommodating the filter units. This filter mounting element is adapted to be swung out laterally from the filter cylinders after opening of a locking device.

Abstract: A flour recycling system includes a compressed air and vacuum head placed over a bakery product conveyor line. Flour is removed from the product units and is conveyed through a vacuum hose to the inlet of a remotely located dual stage separator in which the flour with entrained dough particles is subjected to a two-stage vacuum induced centrifugal separating process. Cleansed flour is drawn by vacuum through two fine mesh sifter screens into two reclaimed flour tanks each containing a vortex eliminator and each having an air release bag. Reclaimed flour is delivered to storage receptacles beneath the tanks through elongated flexible chutes which can be tied off and closed at desired elevations. The tanks, their air release bags and flexible chutes can be individually vacuum cleaned without shutting down the system merely by stopping the operation of one blower while continuing to operate the other blower of the dual blower system, one for each tank.

Abstract: A filtering unit for a bus, the unit comprising one outer housing of a size to fit between the row of seats in the bus and a forwardly facing wall of a bus lavatory behind the seats, the housing having air inlet and air outlet openings for communication with ducts opening in upper and lower portions of the lavatory. The housing comprises a main housing body with an interior horizontal passageway of consistent cross sectional shape extending parallel to the rear of the outer housing, the main housing body having a horizontally facing opening at the outer end thereof which is covered by a panel which is movable to expose said opening, and a drawer unit slidable into or removable from said passageway through said opening. The drawer contains at least an air filter for removing at least lavatory odor-causing gaseous and particle materials from the air stream passing therethrough and an air circulating fan and drive motor therefor.

Abstract: A fluff filtering device within a convection drying and/or setting machine for treating a textile material web includes a device for circulating an air stream through the textile material web, a device for heating the air stream, an active filter screen with a frame of a given thickness disposed substantially horizontally in an operating position upstream of the heating device in the air stream for preventing fluff and other deposites from reaching the heating device, the active filter screen being substantially horizontally removable from the machine for cleaning, the active filter screen being upwardly movable into another position by a distance at least equal to the given thickness, and another screen slideable under the active filter screen into the operating position when the active filter screen is in the other position.

Abstract: An apparatus for the recovery of contaminated air and water from a flow system. The apparatus provides a high efficient compartmentized stacked design embodying removable filters that first effect a moisture separation and then air borne particle filtering, with such functions separated by a fluid collection tank. The apparatus provides structure for ready removal of the filters and collected fluid with minimum down time so as not to interrupt the recovery process.

Abstract: An air filtration system for the operator's cab on a self-propelled crop harvesting machine is disclosed wherein the service door for access to the filter cartridge is positioned above the access door into the cab enclosure. Since the open position of the service door interferes with the opening of the cab access door, the filter cartridge cannot be changed unless the cab door is closed. A movable latch engagement member is engageable with lift members affixed to the service door to lift the latch engagement member out of an engageable position with the door latch to prevent the service door from being latched unless a filter cartridge is positioned within the filtration chamber. The filter cartridge restricts the movement of the latch engagement member to permit engagement thereof with the door latch. The resultant structure provides an air filtration system that requires a filter cartridge within the filtration chamber before the service door can be latched.

Abstract: A self-cleaning collecting device for cleaning a dirty gas stream including a flow-through housing having a dirty gas inlet at the base of the housing and a clean gas outlet at the top of the housing interconnected by a gas treating passage adapted to direct a gas stream vertically through the housing. As the dirty gas stream enters the housing, it is circulated through a liquid bath where noxious vapors and larger particulates are entrained in a mist of liquid droplets which are in turn captured and removed from the gas stream as it moves through a separating panel positioned above the liquid bath. As the gas flows upwardly out of the panel, the captured liquid is circulated to the liquid bath to maintain a flow of liquid within the panel which acts to continuously wash the particulates from the panel.

Abstract: A housing for HEPA filters is disclosed, which includes a side access opening for receiving one or more filters, and a filter clamping assembly for seating and unseating each of the filters against its seal. The clamping assembly comprises a pair of filter clamping mechanisms extending transversely across the interior of the housing and along the top and bottom side walls, respectively. Also, a handle is pivotally mounted between the two clamping mechanisms adjacent the opening, and the handle is connected to each clamping mechanism such that rotation of the handle serves to actuate the mechanisms. In one embodiment, the handle is releasably connected to the two mechanisms, and the mechanisms are releasably mounted to the top and bottom side walls, whereby the entire assembly may be disassembled and removed from the housing through the side access opening to permit the repair or replacement of a defective component.

Abstract: A fluid cleaner device to be used for retaining the dust and contaminants of a fluid, such as the combustion air for an internal combustion engine, comprises a plurality of parallel cleaning cells or units each consisting of a main filter for arresting and collecting the dust and contaminants contained in the fluid to be cleaned, and at least one respective safety filter which is able, in the event of a fissure in the main filter to retain the dust and contaminants not collected upstream by the main filter. The safety filter is a structure that when through crossed by the cleaned fluid induces only low pressure losses, but is rapidly clogged by the dust and contaminants passing through a fissure in the main filter, so that the flow of the fluid to be cleaned which escapes the main filter is rapidly stopped and diverted to other normally functioning cleaning units.

Abstract: A device for filtering stack gases, such as produced by a coal fired electric generating plant, includes a plurality of movable dual filter elements positioned downstream from the point of combustion where dry solid waste including calcium sulphite (CaSO.sub.3) and fly ash are present in the flue gas, the multiple dual filters being arranged for reciprocation into and out of the flue gas stream so that they may be alternately loaded in filtering the dry solid waste from the flue gas and cleaned by a vacuum system, each of the reciprocable dual filters being arranged to actuate a valve controlling communication with the vaccum cleaning system.

Abstract: The present invention is directed to a dust collector (100). Dust collector (100) has a housing (102) separated by partition (130) into inlet chamber (126) and clean air chamber (128). A clean air drum (140) rotatably supports columns of horizontally extending, filter elements (142). A low pressure, high volume pulse apparatus (10) is operable through blowpipe (148) to sequentially provide a low pressure reverse pulse to a column of filter elements (142) thereby separating any dust cake from them and allowing it to fall into conical portion (106) for removal from collector (100) by air lock (108). The motor (158) which rotates blowpipe (148) also disengageably rotates clean air drum (140) and attached filter elements (142) to align a column of filter elements (142) with door assembly (114) for maintenance.

Abstract: An improved self-cleaning air filter (2) of the pulse jet type. The filter includes at least one filter element (20) located in a dirty air plenum (6) which is separated from a clean air plenum (8). A valve (64) directs a cleaning jet of gas that moves in a back flow direction along the filter element to remove accumulated contaminants therefrom. A diffuser is located in the clean air plenum for diffusing the cleaning jet of gas to convert the cleaning jet to a high volume, low pressure jet which substantially fills the entire cross-sectional area of the filter element. The filter element is releasably contained inside the dirty air plenum on elongated support members (36). Rotatable cams (44) are provided for laterally shifting the filter element to lock the filter element in place against a dividing wall (10).

Abstract: Apparatus for filtering air for a powder spray booth. A fan plenum is fixed in an elevated position and has a lower edge lying in an inclined plane. The filter module has an upper edge lying in an inclined plane and has an elastomeric compressible gasket around its edge. The filter module is mounted on wheels so that it can be rolled into edge-to-edge engagement with the plenum and clamped in that position.

Abstract: A plurality of individual filters extend in line across a duct for a gas flow and the duct can be located within secondary containment. The pressure of gas within the duct is less than external pressure and the filters can be supported by a guideway which extends across the duct between opposing walls of the secondary containment with the interior of the guideway communicating with the secondary containment to provide an inward flow purge. The filters in the line are replaced individually by inserting a replacement filter into the line at one end and retrieving the displaced filter at the opposite end of the line.

Abstract: An airtight oven comprises at least two doors and a filter arrangement, through which the air within the oven is circulated in a closed circuit by means of a circulator. This closed circuit optionally includes means for adjusting the temperature of the air. The filter arrangement comprises a frame loosely secured to a resilient, airtight, trumpet-like suspension arrangement which in turn is secured to the rim of a channel permitting passage of the circulating air, whereby the major portion of this rim is formed by the oven shell. In this manner it is possible for the frame of the filter during operation to operate and expand in proportion to the oven shell without the channel thereby leaking.

Abstract: There is disclosed a readily assemblable, inexpensively manufactured table top air filter of the type having a circulating fan. A unitary housing has sides and a top which defines air outlet openings. The bottom of the housing is open. A fan support assembly mounts readily within the housing where it is retained by stops and latch members which are integral with the housing sides. A replaceable filter is also mountable within the housing in line with the fan-induced air flow.

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: An assembly is provided for securing a pair of filter supports to support structure defined by the casing of an air handling unit and for selectively providing flanges for securing a duct to the casing. The filter support includes a filter channel having a channel portion for securing a filter and having a flange portion. The filter support may be mounted in a first position with the flange portion not extending beyond the end of the unit and in a second position with the flange portion extending beyond the end of the unit for promoting connections to a duct. Additionally, duct angles are provided having flanges extending therefrom. The duct angles are mounted to have the flanges extend inwardly when the filter channel does not extend beyond the unit and are mounted to extend outwardly to coact with the flange portions of the filter channels when it is desired to connect a duct to the unit.

Abstract: A plurality of holding tubes are respectively mounted in apertures in a partition plate fixed in a housing receiving gas contaminated with particulate material. A filter cartridge is removably held in each holding tube, and the cartridges and holding tubes are arranged so that gas passes through apertures therein and across the partition plate while particulate material is collected in the cartridges. Replacement filter cartridges are respectively held in holding canisters mounted on a support plate which can be secured to the aforesaid housing, and screws mounted on said canisters are arranged to push replacement cartridges into the cartridge holding tubes and thereby eject used cartridges therefrom.

Abstract: A baghouse filter having a filter chamber separated by a partition between the clean gas side and the dirty gas side. The partition has a plurality of apertures, in each of which is mounted a filter unit for removal and replacement. The housing has an access opening to permit access to the interior of the housing and the opening is sufficiently large to permit withdrawal of the partition from the housing through the opening so as to permit replacement of the filter units exteriorly of the housing. In the present instance, the partition of the housing is mounted on a door closing the access opening, so that the displacement of the access door from the housing automatically displaces the partition from the housing to permit removal and replacement of the filter units. The filter unit assemblies permit mounting of the filter units from the dirty gas side of the partition with suitable sealing to prevent unfiltered gaseous medium from bypassing of the filter units.

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: Entrained particulate matter is separated from the pressurized gas released from an intermediate charge material storage hopper of a blast furnace charging installation, the hopper alternately being pressurized to the furnace pressure for release of charge materials into the furnace and the pressure being relieved to atmospheric to permit reloading, at a point upstream of the filters and/or silencers through which the pressurized gas is released to the ambient atmosphere. The separator comprises a series of perforated discs, which may be heated, associated with a collection chamber into which separated material will fall under the influence of gravity.

Abstract: A method for converting conventional paint spray booths to booths for accommodating either liquid or powder spray paints comprising removing the conventional waterfall or cloth filter back and substituting therefore an exhaust system, velocity stacks, and a roll away filter cart having replaceable and interchangeable filter elements for filtering liquid or powder paints. The rollaway filter cart may also have a vibrating sheet for directing recovered powder toward the bottom of the filter cart.

Abstract: The invention provides an air cleaner assembly in combination with an engine having a blower housing with airflow circulating therethrough and a carburetor having an intake. The assembly comprises a duct having an inlet and an outlet with the inlet angularly disposed through the blower housing, an air cleaner housing having side walls and a bottom wall, and an outlet chamber having an inlet and an outlet in communication with the carburetor inlet. Within the air cleaner housing, a first interior wall is upstanding from the bottom wall and defines with certain side walls an intake chamber having an inlet communicating with the duct outlet, and a second interior wall upstanding from the bottom wall so that a filter chamber is formed between the interior walls having an outlet in its bottom wall so that the filter chamber and outlet chamber communicate through the filter chamber outlet and the outlet chamber inlet.

Abstract: A housing for mounting HEPA filters includes an open-ended tubular casing (12) and, within said casing, slide structure (24) for slidably mounting a HEPA filter therein from one of the ends of the casing. Baffle means (18) divides the interior of the casing into respective chambers (20, 22) which, on mounting of the filter in the slide structure (24), are gastight isolated from each other except by way of the filter and which are accessible from a respective one of the open ends of the casing. Also provided are gas intake/exhaust ports (46, 48) for each of the chambers (20, 22), a pair of cover members (14, 16) for closing the respective open-ends of the casing (12), each of which cover members (14, 16) includes a flange (94) complementary to the associated end of the casing (12), and respective clamp and seal means (100, 84) for clamping the cover members (14, 16) to the casing to effect gastight engagement of the flanges (94) with the respective ends of the casing (12).

Abstract: An elongated tubular natural gas filtering vessel (12) has a plurality of longitudinal tubular filter elements (28) mounted therein by mounting means (44,68,70) which enables lateral displacement of filter elements (28) for longitudinal removal through a forward access port (18) of reduced diameter. A mast structure (44) mounts the filter elements (28) in a matrix array, including perimeteral filter elements (28) not aligned with the access port (18). A central mast (46) is rigidly mounted to the vessel (12) interior, and has a plurality of cross-bars (50) supported thereon. Each cross-bar (50) supports one row in the matrix array. The mast (46) has a plurality of forwardly extending ledges (48) between which are mounted a plurality of latching wrenches (60) with eccentric camming surfaces (64) for releasably locking in place a row of filter elements (28). A superstructure (68,70) is mounted to the mast structure (44) for securing the cross-bars (50) against lateral movement relative to one another.