Abstract: A filter screen assembly for use with an air intake structure, the structure including a face within which is formed an air intake opening. The filter screen assembly includes a screen having a flexible mesh material and an outer perimeter edge. A three-dimensional component, including such as a multi-sided frame or a plurality of spacer collars, are secured to the face of the intake structure surrounding the opening. The screen is secured about locations associated with its outer perimeter to the face of the air intake structure to space the screen from a surface of the air intake structure and in order to filter out contaminants associated with an air stream entering the intake structure. Spacing the screen also prevents objects impacting the screen from damaging such as the surface coils associated with the air intake opening.

Abstract: A screen assembly, associated kit and method of forming the same. The screen assembly is adapted to filter intake air passing through an exterior surface of an air processing unit, and includes a substantially rectilinear screen mesh having opposing top and bottom edges, opposing proximal and distal edges, and top and bottom contact surfaces which laterally extend along the respective extents of the top and bottom edges. The screen mesh is formed from a plurality of transversely aligned, spaced apart filaments arranged to filter contaminants from the inlet air. Opposing first and second attachment members respectively secure the proximal and distal edges to the exterior surface so as to apply a tension force to the screen mesh which seals the top and bottom contact surfaces in direct contacting abutment against the exterior surface, thereby eliminating the need for one or more mechanical fasteners along the top and bottom edges.

Abstract: An air filter. The air filter may include a frame made of a beverage board material, a filter media with a number of pleats, and one or more stiffener bands. The stiffener bands may include a number of teeth sized to mate with at least one of the pleats.

Abstract: A dedusting device 1 with a demister 15 advantageously arranged standing obliquely has a very compact construction because sufficient moistening or wetting of dust-containing crude air 24 is possible through the use of intensively acting multiple stream nozzles 33. The ventilator 11 is allocated to its own ventilator housing 18 that is connected to the dedusting device housing 10 and has a muffler 20 inserted downstream.

Abstract: A filter assembly for a structure having an air intake, the filter assembly including a filter media that is sized and shaped to cover the air intake. The ends of the filter media are connected by an elastic fastener, such that the filter media and the fastener encircle the structure and are under tension to hold the filter assembly on the structure. The filter media is a web of synthetic fibers, such as a web of fibers woven in a 3-dimensional pattern or a nonwoven mesh.

Abstract: A filter screen assembly for use with an air intake structure, the structure including a face within which is formed an air intake opening. The filter screen assembly includes a screen having a flexible mesh material and an outer perimeter edge. The perimeter edge is secured at specified locations to the face of the air intake structure, by a plurality of fastener components each including a fixed portion and an actuating portion, in order to filter out contaminants associated with an air stream entering the intake structure and to prevent the screen from being drawn into the air intake opening. Alternatively, at least one elongated track may be secured to a face of the intake structure proximate the intake opening and, in use with a plurality of traversably secured trolley hooks, operates to advance the screen in a given fashion across the intake opening.

Abstract: An air filter for an internal combustion engine having a rigid type ceramic filter element made by foaming oxygen-rich ceramic powder for creating a plurality of pass-through holes. In this way, the incoming air obtains a thorough contact with the oxygen-rich powder. Meanwhile, the material of the oxygen-rich ceramic releases negative ions to activate the air entering into the internal combustion engine. Moreover, nano-sized platinum black is coated to the surface of the pass-through holes of the ceramic filter element. So, the incoming air passing through the pass-through holes of the ceramic filter element is catalyzed in chemical reactions to divide the water molecule cluster into smaller particles. Meanwhile, the freedom of water molecule is increased to permit an instant decomposition of oxygen and nitrogen molecules, a complete combination with the fuel injected into the internal combustion engine, and a thorough mixing and a better combustion efficiency.

Abstract: This filter-drier for removing moisture from a refrigerant includes a casing having an inlet for receiving refrigerant, an outlet for discharging refrigerant and a molded core, formed from dessicant and a binder, and disposed in the casing between the inlet and the outlet and receiving refrigerant flow therethrough. The molded core includes an outer surface at least in part engaging the inner surface of the casing. The core is held within the casing against axial movement by bonding with the casing or by an indentation protruding into the core or both.

Abstract: A register assembly for covering an air duct opening is comprised of a faceplate, a base, a damper mechanism and a filter frame that are easily assembled together. Most if not all of the component parts may be constructed of plastic reducing the manufacturing cost of the register assembly. The faceplate can be snapped onto the base or manually removed from the base without the use of fasteners or tools. The faceplate is replaceable, allowing the use of various ornamental designs of the faceplate grid on the same base containing the damper mechanism and filter frame. The filter frame is easily removed from the base to allow replacement or cleaning of the filter materials supported in the frame.

Abstract: This filter-drier for removing moisture from a refrigerant includes a casing having an inlet for receiving refrigerant, an outlet for discharging and a molded core disposed in the casing between inlet and outlet. In one embodiment, the core includes an outer surface in part engaging the inner surface of the casing. Axial movement of the core is prevented by bonding with the casing or by an indentation protruding into the core or both. Another embodiment-includes a filter media pad bonded to the core sufficiently to hold the pad in place eliminating the need for outlet support screens. In another embodiment suitable for reversible operation in a heat pump system, the filter-drier includes a hollow cylindrical core having a filter media bonded to the core and defining a filter media lined passage, the core being held in place by end plates having opposed axial check valves and offset check valves.

Abstract: A self-cleaning strainer which may be installed upstream of a heat exchanger to prevent debris greater than a critical size from reaching the heat exchanger. The strainer is preferably mounted just upstream of a heat exchanger in order to minimize the possibility of debris reaching the heat exchanger. The strainer comprises a screen element which can be advanced across the flow path of the fluid between two rollers. The screen element is placed so that the fluid must flow across the screen element face to continue through the process pipe; the screen may be perpendicular or parallel to the fluid flow axis of the strainer body or at an intermediate angle to it. Flow blocking members are used so as to direct the flow to pass through the screen element.

Abstract: A filter medium and frame therefore wherein the filter medium is treated by a novel adhesive comprised of a major portion by weight of an oil group consisting of vegetable and animal oils and a minor portion of a preselected thickening material with the rigidity of the filter medium being obtained by sandwiching the filter medium between joined mating upstream and downstream frame members.

Abstract: There are provided a sheet of filtration, separation or reaction elements, a method for preparing such a sheet, a filtration, separation or reaction module comprising at least one such sheet, and a method for preparing this module.

Abstract: An integrated filter body and adsorbent unit capable of being integrally fastened together for easy and economical assembly into a refrigerant pressure vessel assembly. The integrated filter and adsorbent unit includes a filter puck, an adsorbent unit mounted to the filter puck, and an integral feature on the filter puck for integrally fastening the adsorbent unit to the filter puck. The adsorbent unit includes a desiccant bag and a flap that has a mounting aperture and a fastening hole extending therethrough. The filter puck includes a disc-shaped body portion and a projection for cooperation with the fastening hole of the adsorbent unit. The projection is displaced to form an enlarged head for trapping the flap of the desiccant bag to the filter puck.

Abstract: An air purifier including a housing supporting an air inlet, an air outlet and an air flow passage interconnecting the air inlet and the air outlet. The airflow passage is defined by a filtration chamber positioned upstream from a blower chamber and an ultraviolet light chamber. A blower assembly is supported within the blower chamber and includes a fan driven by a motor for forcing air through the air flow passage from the air inlet to the air outlet. A pre-filter and a main filter are removably supported within the air filtration chamber for entrapping particulates having a size of 0.3 microns and greater. An ultraviolet light source is positioned within the light chamber and is positioned proximate the air outlet. An outlet grille is supported proximate the air outlet and provides for the passage of air while substantially preventing the passage of ultraviolet light. The outlet grille includes a louver assembly including a plurality of blades defining a plurality of convoluted passages.

Abstract: A desorbable sorption filter, in particular for a heating or air-conditioning system of a motor vehicle, has a metallic support (12) which can be heated by flow of current and an adsorber (14) mounted at or on the support (12). To provide an improved, directly heatable sorption filter which particularly enables inexpensive production and good electrical and thermal conductive contact without the use of adhesives, it is proposed for the adsorber (14) to be of planar design and to be mechanically connected to the support (12, 112) by means of holding elements (26) formed integrally on the support (12, 112).

Abstract: A register assembly for covering an air duct opening is comprised of a faceplate, a base, a damper mechanism and a filter frame that are easily assembled together. Most if not all of the component parts may be constructed of plastic reducing the manufacturing cost of the register assembly. The faceplate can be snapped onto the base or manually removed from the base without the use of fasteners or tools. The faceplate is replaceable, allowing the use of various ornamental designs of the faceplate grid on the same base containing the damper mechanism and filter frame. The filter frame is easily removed from the base to allow replacement or cleaning of the filter materials supported in the frame.

Abstract: A filter assembly for use in an air filtration unit, particularly for filtering cooking vapors. The assembly includes a filter disposed across an air flow and a grease pre-filter located upstream of the filter. The grease pre-filter is formed principally from wool fiber having an approximate density of 150-200 g/m2 and a loft of substantially 15-20 mm. The use of such a pre-filter substantially prolongs the service life of the filter before cleaning is required.

Abstract: An improved air filtration method and device by which to more effectively clean the ambient air (19) being fed into a motor vehicle's passenger compartment, via the existing OEM ventilation and heating/air conditioning system (10, 15, 16). The notion of a special more conveniently accessible air filtration appliance (21) is set forth with generic variants showing adaptability to differently configured OEM air outlets. The new technique contemplates treating the air instantly as it is being discharged into the passenger compartment; yet remains compatible with existing OEM air filtration provision, some of which are provided at the cowl inlet, others are located mid stream within the ducting system.

Abstract: An intake duct for introducing outside air into an air cleaner of an internal combustion engine is provided which includes a hollow duct body with an opening, and a piece of non-woven fabric, formed in a flat shape, is joined to the duct body to close the opening. The duct body includes a circumferential wall formed of a resin, and the opening is formed along a plane extending through a portion of the circumferential wall. The piece of non-woven fabric is fixed to the duct body so that some of the resin of the duct body penetrates into the non-woven fabric.

Abstract: A filter screen assembly for mounting over an air intake opening of a structure. The structure has a height, a width and a depth and defines a selected face within which the air intake opening is formed. The selected face further includes a top, a bottom, a first side and a second side surrounding the intake opening. A planar and flexible filtration screen defines a substantially rectangular shape with by a top edge, a bottom edge, a first side edge and a second side edge. Fasteners are provided for securing at least first and second sides of the screen to corresponding sides of the intake structure and include eyelets formed within the screen which are supported upon tubular portions extending from the structure and fasteners which secure within the tubular portions to affix the screen in place.

Abstract: The present invention 10 discloses an air filter element 18 that is partially fabricated on site wherein one or more wire frames 28 are fastened to one another using a high tensile strength adhesive tape 34 to form a structure substantially conforming to the dimensions of the original equipment manufacturers' filter housings 20. The filter media 18 is attached to the rigid wire frame 28 by selectively drawing pleats 24 around a portion of a wire member 28 and securing the pleats to each other by means of epoxy coated staples 36 thereby securing the filter media 18 to the wire frame 28. Whereupon the on-site partially fabricated filter element 18 can be inserted into the channels 30 of the appropriate original equipment manufacturers filter housing 20 wherein the skirt 38 of the on-site fabricated filter element will fill and conform to the filter housing channel 30 providing an air-seal thus forcing all airflow through the air filter 18.

Abstract: An air filtration method and device which more effectively clean the ambient air being fed into a motor vehicle's passenger compartment, via the existing OEM ventilation and heating/air conditioning system. The notion of more conveniently accessible air filtration appliance is set forth with generic variants showing adaptability to differently configured OEM air outlets. The new technique contemplates treating the air instantly as it is being discharged into the passenger compartment, yet remains compatible with existing OEM air filtration provisions, some of which are provided at the cowl inlet, others are located mid stream within the ducting system.

Abstract: A frame assembly is adjustable to fit within a range of desired openings and includes juxtaposed first and second frame units detachably assembled together. An intervening media material is releasably sandwiched between the frame units. The media material defines a slotted perimeter flap that protrudes outwardly beyond at least one outside peripheral edge of the frame units to engage and to seal a space between a perimeter defining the desired opening and the frame assembly. The frame units are detachably engaged by a mounting assembly adapted to secure the frame units over the desired opening.

Abstract: A safety cabinet having a work area defined by an enclosure and including an air circulation and cleaning system. The air circulation and cleaning system includes a plurality of air plenums and passageways through which air is circulated by a blower assembly. A portion of the air exiting the blower is directed through a transition boot and exhaust plenum and a remaining portion of the air exiting the blower assembly is directed into the work area through a perforated divider plate and a supply plenum. The transition boot between the exhaust and supply plenums include resealable fasteners disposed along a seam between first and second ends thereof and around a first end thereof which is attached to the exhaust plenum.

Abstract: An air filter kit for residential and light commercial air filtration applications including a user assembled, dimensionally adjustable, air filter frame assembly capable of telescopic adjustment of both length and width. Telescopic adjustment is facilitated by a plurality of slidably engaged frame members which together form an adjustable peripheral filter frame defining a recessed channel for receiving a quantity of filter media therein. Adjustment of the frame members is further facilitated by the use of a lubricating substance such as a friction reducing synthetic tape between the members. A quantity of spongy filter media is secured cut to size and secured within the recessed channel by a quantity of hook material projecting into the filter media. A perimeter gasket anchors the frame dimensions while providing a positive seal between the frame and a filter track.

Abstract: A register assembly for covering an air duct opening is comprised of a faceplate, a base, a damper mechanism and a filter frame that are easily assembled together. Most if not all of the component parts may be constructed of plastic reducing the manufacturing cost of the register assembly. The faceplate can be snapped onto the base or manually removed from the base without the use of fasteners or tools. The faceplate is replaceable, allowing the use of various ornamental designs of the faceplate grid on the same base containing the damper mechanism and filter frame. The filter frame is easily removed from the base to allow replacement or cleaning of the filter materials supported in the frame.

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: An air filter designed to be placed at a definite distance L beyond the periphery of the primary airflow which is created by an operating fan, and attached to a stationary element of the fan or to a stationary element of an enclosed space with fasteners which are, at the same time, vibration isolation units. The present invention greatly reduces the creation and release of fine particles of soot, mold, dust mites, etc. Five modifications of the invention are described, as well as the way to determine a distance L when the fasteners are used with ceiling fans, diffusors and other conventional fans. When an operating fan with a weighted base is used, the base acts as an additional vibration dampening unit, which further limits creation of fine toxic particles.

Abstract: A carburetor air intake velocity stack engagable with a carburetor inlet, has a cylindrical throat section having first and second ends. The first end is adapted to be coupled to the carburetor, while the second end is open to the air. A shaped, mesh filter having an effective open area which exceeds the open area of the velocity stack by at least about 50%, is located within said air intake velocity stack. The filter has a cylindrically formed flange member which is trapped between said air intake velocity stack and the carburetor.

Abstract: A cyclone and inlet duct apparatus which includes a cyclone having a cylindrical axial portion. The cylindrical axial portion has a metallic housing and the housing has wall. The apparatus also includes a rectangular inlet duct that has an interface with the cylindrical axial portion of the cyclone. The rectangular inlet duct is disposed in fluid communication with the cylindrical axial portion of the cyclone. One side of the rectangular inlet duct is disposed in generally tangential relationship to the wall of the cylindrical axial portion of the cyclone. A first refractory material stop block extends vertically in the cylindrical axial portion of the cyclone proximate to the wall of the cylindrical axial portion and proximate to the intersection of a first side of the inlet duct and the cylindrical axial portion in substantially parallel relationship to the intersection of the first side of the inlet duct and the cylindrical axial portion.

Abstract: A grill filter assembly for mounting in the exit or entrance wall opening of a forced air duct wherein the grill plate may be installed in a hinged relation to the duct enabling easy access to the duct opening. In a preferred embodiment, the grill face plate is adapted to have a particulate filter and/or, if desired, a scent dispenser disposed thereon and the hinged relation of the face plate enables easy access to the filter for the changing thereof. Since the grill filter assembly is adapted to be mounted directly into the exit or entrance opening of the duct, the faceplate contains no unsightly screws or other fixtures as are common on heating and air conditioning registers and face plates. In a preferred embodiment, the assembly includes match means for cooperating with the wall to expeditiously mount the assembly in the duct.

Abstract: A filter frame that includes a hinge structure for coupling a series of like filter frames together such that the series of filter frames may be folded together. Moreover, the filter frame includes a series of separable sub-sections that correspond to standard filter sizes. This enables an original filter frame to be "broken down" to a number of smaller standard sizes.

Abstract: A combination respiratory filter and sampling device has been developed which collects airborne contaminants for respiratory exposure measurements. The devices, which fit existing commercial half-mask respirators, are generally smaller and lighter in weight than existing filters, and have low resistance to airflow, so they can be comfortably worn by people performing their normal work duties. Each device consists of at least a front, a middle and a back section which can be independently separated and analyzed by traditional laboratory techniques. The filtering and sampling media thicknesses and types can be adapted to target specific compounds.

Abstract: A combination respiratory filter and sampling device has been developed which collects airborne contaminants for respiratory exposure measurements. The devices, which fit existing commercial half-mask respirators, are generally smaller and lighter in weight than existing filters, and have low resistance to airflow, so they can be comfortably worn by people performing their normal work duties. Each device consists of at least a front, a middle and a back section which can be independently separated and analyzed by traditional laboratory techniques. The filtering and sampling media thicknesses and types can be adapted to target specific compounds.

Abstract: A filter support assembly (12) has a base (26) with a mounting surface (28), a rim member (34) with a flat surface (38) and post members (32) connecting the rim member to the base. Apertures (40) and the area surrounding by the rim member (34) provide air passages. One element (46) of a hook and loop connector (20) is attached to the mounting surface (28) on the base (26) by an adhesive. The other element (48) of the hook and loop connection (20) is secured to the wall (22) by an adhesive and surrounds the air inlet (50) to the housing (24). When the elements (46) and (48) are in engagement with each other, the filter support assembly (12) is secured to the housing (24) and a seal is formed between the base (26) and the wall (22) of the housing (24). A primary filter element (14) is removably secured to the surface (38) on the rim member (34). A side filter element (16) is removably secured to the support assembly (12) in a position covering the apertures (40).

Abstract: A combination respiratory filter and sampling device has been developed which collects airborne contaminants for respiratory exposure measurements. The devices, which fit existing commercial half-mask respirators, are generally smaller and lighter in weight than existing filters, and have low resistance to airflow, so they can be comfortably worn by people performing their normal work duties. Each device consists of at least a front, a middle and a back section which can be independently separated and analyzed by traditional laboratory techniques. The filtering and sampling media thickness and types can be adapted to target specific compounds.

Abstract: A combination respiratory filter and sampling device has been developed which collects airborne contaminants for respiratory exposure measurements. The devices, which fit existing commercial half-mask respirators, are generally smaller and lighter in weight than existing filters, and have low resistance to airflow, so they can be comfortably worn by people performing their normal work duties. Each device consists of at least a front, a middle and a back section which can be independently separated and analyzed by traditional laboratory techniques. The filtering and sampling media thicknesses and types can be adapted to target specific compounds.

Abstract: A pocket filter includes a front frame which accommodates at least two filter bags. The top of each bag accommodates a reinforcing frame. The bags are secured dust-tight to one another, to the reinforcing frames, and to the front frame. The front frame is a severed at at least one point along its perimeter. The front frame has a U-shaped channel around it that opens inward, and the reinforcing frames can be inserted into the channel when the front frame is open at the severed point. The reinforcing frames match each other and match the size of the front frame, creating a dust-tight contact between all the adjacent reinforcing frames and the inner surface of the channel when the front frame is closed at the severed point. Facing webs, disposed in the channel opening on each side of the "U", create a dust-tight contact with the reinforcing frame.

Abstract: A combination respiratory filter and sampling device has been developed which collects airborne contaminants for respiratory exposure measurements. The devices, which fit existing commercial half-mask respirators, are generally smaller and lighter in weight than existing filters, and have low resistance to airflow, so they can be comfortably worn by people performing their normal work duties. Each device consists of at least a front, a middle and a back section which can be independently separated and analyzed by traditional laboratory techniques. The filtering and sampling media thicknesses and types can be adapted to target specific compounds.

Abstract: A fluid filter is of the kind having a tubular flow-through core surrounded by a pleated wire cage around which a filter medium in the form of a pleated bag is mounted with the pleats in the bag extending into and around the pleats of the wire cage. The filter medium is formed by a sheet of filter material having draw-string ends which fold over and are tied down on opposite ends of the cage. Sealing assemblies which eliminate the need for conventional gaskets are used to seal the folded over and tied down ends of the filter medium. The arrangement facilitates the assembly, removal and re-use of filter media.

Abstract: A hanger-supported liquid-gas contact body includes a pad of cross corrugated fill having a width, top, front and back, and the pad has a transverse slot running across at least a portion of the pad's width. The slot starts at and forms an angle .alpha. with the back, so that the slot runs toward the pad front. A bent hanger having first and second legs is bent at an angle .theta. which is approximately equal to angle .alpha., and the first leg is disposed in the slot and the second leg abuts a portion of the pad back. In addition, a method for supporting cross-corrugated fill includes providing a pad of cross-corrugated fill having a width, top, front and back, the pad having a transverse slot running across at least a portion of pad width, this slot starting at and forming an angle .alpha. with the back. The slot runs toward the front of the pad. The method also involves providing a bent hanger having first and second legs, the hanger being bent at an angle .theta. which is approximately equal to .alpha.

Abstract: A paint arrestor for absorbing paint overspray comprises a series of layers of sheet material, each of the layers being slit and expanded to define an array of air spaces distributed in columns. The air spaces alternate in size from column to column and repeat in size in every other column. Means are provided for securing the layers in contiguous, overlying relationship with one another.

Abstract: A modular forced-air register includes two main sub-assemblies. A housing with an opening can be disposed into a hole in the floor of a room. A second sub-assembly includes a louver plate with a grid work of tri-directional vanes. Air flow is controlled by a slide grille disposed beneath the grid work and carrying an integral filter substrate secured to the slide grille. The two sub-assemblies are detachably connected to each other by an arrangement of bosses and recesses as well as a projection mounted on a flexible tang configured and disposed to engage a pocket configured in a thin wall region of the opposing sub-assembly.

Abstract: The present invention entails a kit having comprised of a filter frame, at least one replaceable filter sheet, and fasteners for attaching the filter frame to an air return duct. The filter frame includes an air inlet side that includes a series of spot fasteners formed on the air inlet side wherein the fasteners serve to attach the filter sheet to the air inlet side of the filter frame. The filter sheet can be easily detached from the air inlet side of the filter frame and replaced by a fresh or new filter sheet.

Abstract: The air intake of a conventional automobile which is mounted in front of the windshield under the air intake cover at the rear of the hood is modified by the introduction into the duct of the air intake of a filtration pillow. The pillow is formed from a plurality of separate layers of filtration material including impregnated or particulate absorption material. The absorption material is arranged for extraction of combustion products particularly hydrocarbons, carbon monoxide, nitrogen oxides, soot and the like. The filter member can also prevent the entry of debris, leaves and the like together with the rodents or insects.

Abstract: An air filtering device for a motor vehicle having a vent for air intake. The air filtering device includes a housing having a plurality of apertures disposed therein, a filter element, and connecting means to removably couple the housing and filter element to a position overlying the vent on the motor vehicle. The housing engages the body of the vehicle, and the filter element is positioned within the housing so that air normally passing into an air intake vent first passes through the apertures located in the housing and is filtered by the filter element. The air filtering device can take a variety of shapes and sizes so that any vent orientation may be adequately fitted and filtered. The air filtering device is easily removable for cleaning and/or replacement of the filter element.

Abstract: The disclosure describes a filtering apparatus and a method for manufacturing a filtering apparatus comprising a housing and a filter arrangement disposed within the housing. The housing may have first and second identical body portions. The filter arrangement, which may include an end cap and a filter element, may be secured within the housing solely by mechanical compression between the first and second body portions.

Abstract: An external spark arrestor assembly attached directly to the outer shell of a muffler of an internal combustion engine. The assembly includes a spark arresting screen disposed over the exhaust port of the muffler and forming a first exhaust-receiving conduit between the screen and the muffler; an outer perforated cover disposed over the screen and forming a second exhaust-receiving conduit between the screen and the outer cover; and a single centrally located fastener for removably fastening the screen and outer cover to the muffler shell.

Abstract: A filter assembly for filtering the cooling air entering the starter housing of a small air-cooled internal combustion engine. The assembly includes a plurality of upstanding brackets attached to the perforated face of the starter housing. The brackets include hook-shaped upstanding ends. A foam filter medium includes a plurality of slits formed therein, which correspond to the brackets. The filter is placed over the brackets and against the face of the housing such that the brackets receive the respective slits. A retaining ring is snapped into the hook-shaped ends for retaining the filter and for biasing the filter against the face of the starter housing to form a tight seal therebetween.