Abstract: An air cleaner assembly having a body member and a removable cover is provided. The assembly includes a lock assembly for engagement between the cover and the body member. The preferred lock assembly is a rotation activated lock assembly movable between locked and unlocked orientations by a selected amount of relative rotational movement between the cover and the body member.

Abstract: An air filter element includes structure for supporting a secondary air filter element mounted within it, such as a safety element. In certain arrangements, the air filter element includes a media pack having first and second ends and defining an open filter interior. A first open end cap is positioned on the media pack first end. A second closed end cap is positioned on the media pack second end. The spacer construction has attachment structure and positioning structure. The attachment structure secures the spacer arrangement within the open filter interior, and the positioning structure extends from the attachment structure. In one illustrated embodiment, the spacer construction includes an insert embedded within the second closed end cap. In one illustration, the insert has a circular disk with feet and a centrally extending post with a fin arrangement.

Abstract: An adjustably directable clean air delivery supply assembly which provides clean air for use in weather protected environments. This assembly is, doorway passable and rollably positioned, to be utilized where activities require very clean air per strict specifications. When located, the device can quickly be unfolded and positioned for operation to produce clean air in the desired direction at minimal-eddy producing airflow. Surrounding unfiltered air is drawn in just above floor level through a pre-filter into a airtight lower hollow housing, which contains an interior powered air moving assembly, and discharged upwardly into the tower hollow housing which is supported on top of the lower hollow housing. Secured to the tower hollow housing is an adjustable telescoping height and rotatable positioning structural tube, which receives and directs the air upwardly through a self-sealing bellows into the top final filter hood assembly.

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

Abstract: An air cleaner assembly having a body member and a removable cover is provided. The assembly includes a lock assembly for engagement between the cover and the body member. The preferred lock assembly is a rotation activated lock assembly movable between locked and unlocked orientations by a selected amount of relative rotational movement between the cover and the body member.

Abstract: An air cleaner assembly having a body member and a removable cover is provided. The assembly includes a lock assembly for engagement between the cover and the body member. The preferred lock assembly is a rotation activated lock assembly movable between locked and unlocked orientations by a selected amount of relative rotational movement between the cover and the body member.

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

Abstract: A vent filter assembly for use with containers containing hazardous chemical or radioactive waste, the assembly having a first stage attached to the container having a first filter media, preferably sintered steel, which allows unaltered passage of pure gas but which blocks passage of particulate matter, and a second stage removably attached to the first stage, the second stage allowing passage of gas but blocking passage of particulate matter and volatile organic solvents. Removal of the second stage from the first stage allows a pure sample of gas to be drawn through the first stage, whereupon the second stage can be reattached to the first stage to provide the required filtering of volatile organic solvents.

Abstract: A novel soot filtering cap in a range hood includes a hood body, a soot absorbing perforated filter and a magnetic strip frame. A hook and loop fastener is provided on the peripheral rim of the vent cap of the hood body. The filter is made of fabric material having strong oil absorbability and strong gas penetrability and is fastened on the peripheral rim of the vent cap of the hood body. A plurality of vent holes are provided on the filter for smooth venting during operation of the range hood, while soot are completely absorbed by the filter. Furthermore, the plane area of the filter is larger than the cross section area of the vent cap and a protective edge is provided on the periphery of the filter.

Abstract: An oil separator for separating oil from oil-laden air has a housing, an inlet for oil-charged air to enter the housing, one or more coalescer elements arranged on a support body inside the housing, and outlets for the separated air and for the separated oil to exit the housing. Each end of the support body and a corresponding end of the coalescer element are fastened to a molded component. At least one molded component is in sealing contact with a sealing surface of the housing.

Abstract: An air register with a filter element for filtering particulars from the air flowing from the ductwork into a room. The filter element is replaceable as necessary and is sandwiched within a recess in the register face plate by a pivotable retaining plate. The retaining plate lockingly engages the face plate to retain the filter across the openings of the register. The retaining member facilitates replacement of the filter without having to remove or disassemble the body of the register.

Abstract: A filter ventilator for installation in an opening of a wall of a switchgear cabinet or the like, having a base housing receiving the filter, which is covered with a finned screen and which is connected with a ventilator on a side facing away from the finned screen. For a considerably simplified mounting of the filter ventilator, detent cams are molded on the base housing for fastening the ventilator. The detent cams engage bores in the facing flange of the ventilator. L-shaped holding elements are formed on the base housing which, facing the flange of the ventilator which faces away from the finned screen, have detent cams which engage bores of the flange. The L-shaped holding elements and the base housing form receivers, into which the ventilator, which is placed angularly offset on the base housing, can be rotated to a stop.

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: An air treatment system having a relatively large capacity yet a relatively small footprint and low sound level. The air treatment system includes a housing defining adjacent vertically extending inlet and outlet chambers. A blower is mounted within the inlet chamber to move air through the system. A generally planar filter is contained within the outlet chamber and is spaced apart from the rear wall of the housing to define a plenum. The rear wall of the housing is curved so that the plenum is tapered to provide uniform pressure over the face of the filter. The system is adapted to rest upon the floor or mount either vertically or horizontal to a wall. Additionally, the system includes a control mechanism that allows the system to run at full speed for a predetermined period of time and then automatically return to its previous speed level.

Abstract: A filter assembly for a fluid compressor, the filter assembly including a first filter housing having a sealing boundary and a fluid inlet; a filter element supported on the sealing boundary, the filter element having a filter media made integral with a first side seal member, a second side seal member, and a bottom seal; a second filter housing seated on the filter element, the second filter housing having a filter loading member for loading the side seal members to cause the bottom seal to sealingly engage the sealing boundary; and clamp members for maintaining loading on the side seal members.

Abstract: A filter (32) is provided for a medical sterilization container (10) having a port (18,22,24) allowing fluid communication between the interior of container (10) and the surrounding environment. A peripheral frame (44) is adapted to cooperate with the port (18,22,24). A plurality of cross-members (54) span an aperture (48) formed by a frame (44). A filter medium (58) is disposed across the aperture (48) so as to be interposed between the interior of the container and the cross-members (54).

Abstract: A filter apparatus for mounting over an opening at an end of a forced air system duct has a filter frame with sidewalls between open front and back ends and a channel which opens inwardly of the sidewalls. At the front end is a sheet of preferably self charging electrostatic washable filter material behind a grill, both of which are peripherally disposed within the channel and are sized and sufficiently flexible so as to be removably insertable into the channel. A second sheet of a second filter material, preferably including activated charcoal, may be disposed in the channel behind the first sheet of filter material. The filter material may be made of a woven polypropylene and the sheet may have heat sealed finished edges. A wall mount having a support frame for mounting on a wall around the opening which extends through the wall is sized and operable to support the filter frame. The support frame may be mounted to a wall.

Abstract: An air filter assembly for a pneumatic tool for receiving compressed air through a compressed air supply port from a compressed air supply source, includes: a cylindrical body having at least one air hole therein and an opening at one end thereof, the air hole allowing an inner space to communicate with an outer space; a filter attached to the cylindrical body; a female screw thread part and a male screw thread part for connecting the cylindrical body to the compressed air supply port such that the cylindrical body and the filter attached thereto are set inside the pneumatic tool.

Abstract: An air filter unit for use with an air ventilation control nozzle in the cabin of an aircraft. The air filter unit includes a housing containing a filter medium, wherein the filter medium has a first side and a second side. The housing includes an inlet port positioned on the first side of the filter medium and an outlet port positioned on the second side of the filter medium, wherein the inlet port includes a connecting member dimensioned to snugly fit over the circumference of the ventilation control nozzle.

Abstract: An air cleaner (10) includes a housing (12) having a first section (14) and a second section (16). The first and second sections (14) and (16) are rotationally adjustable relative to one another. Alignment teeth (42) and (60) engage one another to position the two sections (14) and (16) relative to one another. Buckle type clasps (60) engage a ridge (44) to cam together the sections (14) and (16) and lock them in sealed engagement. A mounting bracket (80) includes a somewhat flexible band (82) which extends around the housing (12). The band (82) includes raised block portions (88) extending radially inward and spaced about the inner surface of the band (82). The housing includes a locking portion (30) having recesses formed therein which are spaced and aligned to receive raised block portions (88) of the mounting band (82). When the bracket (80) is placed around the housing (12), the raised block portions engage the recesses of the lock portion (30) and the bracket (80) is held in place.

Abstract: An in-line filter includes a hollow base having first and second wall portions formed between its ends and a filter element mounted on the base. During use, the base of the filter is disposed inside a standard tubing connector, and the wall portions are resiliently deformed by the tubing connector such that the surfaces of the wall portions are pressed into sealing contact with internal surfaces of the tubing connector. The filter element connected to the base is disposed inside the tubing connector and/or tubing to which the tubing connector is attached. According to another form of the invention, a filter element includes a hollow base having a radially outwardly extending flange. An annular sealing member is mounted on the flange, and a filter element is mounted on the base. During use, the base of the filter is disposed inside a standard tubing connector, and the sealing member is pressed into sealing contact with internal surfaces of the tubing connector and with the flange.

Abstract: A filter (32) is provided for a medical sterilization container (10) having a port (18,22,24) allowing fluid communication between the interior of container (10) and the surrounding environment. A peripheral frame (44) is adapted to cooperate with the port (18,22,24). A plurality of cross-members (54) span an aperture (48) formed by a frame (44). A filter medium (58) is disposed across the aperture (48) so as to be interposed between the interior of the container and the cross-members (54).

Abstract: A pressure side integrated air filter assembly for a turbocharged engine includes an air filter carrier which is designed and arranged to receive an air filter element and which is adapted to mount to the intake manifold of the turbocharged engine. The air filter carrier which receives an air filtering element is disposed within the intake manifold and the intake manifold cover serves as the air filter cover. A peripheral flange on the air filter carrier is used to support the air filter assembly by being clamped between the intake manifold cover and the intake manifold. This peripheral flange substitutes for the intake manifold gasket. The air filter carrier and the air filter element each have a trapezoidal shape in cross section as a way to conserve space within the intake manifold.

Abstract: A filter assembly for a coolant air stream flowing through an LRU box has a base frame with a large opening superimposed on the perforated top surface of the box. A filter element is superimposed over the opening and a cover having a large opening is hinged to the base frame and latched thereto with its opening aligned with the other opening. The filter assembly is clamped by means of a harness to the LRU box with a clamping band that wraps around one end of the LRU box and one end portion of the base frame simultaneously. Spring tensioned cable sections attach to the band and extend diagonally along the sides of the LRU box and then through eyelets on the opposite end portion of the base frame so the cable develops a vertical component of force for clamping the assembly to the LRU box.

Abstract: An apparatus and method for providing a scent to a compartment comprising a reusable holder having a connecting means and a scented card insertable into the holder. The connecting means can be a clip which is connectable to a louver of an air duct outlet register of a forced air system or to a fan guard of a utility fan. The apparatus can also be modified to attach to an interior surface of a refrigerator and may even be adaptable for use as costume jewelry. The scented card is produced by a process wherein a heat extrudable thermoplastic material is mixed with a chemical blowing agent and at least one fragrance and optionally a coloring agent, the mixture of material and fragrance is heated and extruded to produce a flat fragrant sheet of material which after being trimmed, forms a relatively rigid but flexible card insertable into the holder and removable therefrom.

Abstract: A venting mechanism which includes three members. A first member having threads defined thereon connected to a second offering a hexagonally shaped external surface. The third member features a bore which defines an annular surface at the intersection with a bore through the second member. A baffle is located within the bore of the second member by engagement with the annular surface defined between the second and third member. A Gortex film and a wire mesh placed within the bore of the third member are retained by a rolled lip thereof. In this manner, the baffle and the Gortex film act to maintain liquid on one side of the breather while allowing gases to freely pass therethrough.

Abstract: A filter retaining device for a furnace having a casing and requiring a filter includes a filter retaining wire for securing the filter over an opening provided in the casing. The retaining device also includes a latch clip and a retainer clip which are each insertable through a corresponding hole in the furnace casing. One end of the filter wire is moveably secured by the retainer clip. The other end of the filter wire has a U-shape formed therein so that it can be easily snapped into and out of the latch clip. Each clip has a pair of flexible barbed detentes so that it may be securely snapped into its corresponding hole.

Abstract: A gas generator, which can be used to inflate an airbag, that has a perforated outer housing wall, a fuel chamber, an expansion chamber which adjoins the fuel chamber and is connected to the fuel chamber via openings, includes a surrounding filter resting against the outer housing wall. A filter tube holds and supports the filter. To provide a secure and uniform sealing of the edge of the filter along the entire circumference of the outer housing wall, a ring-shaped clamping device is provided between the filter tube and the edge of the filter. The clamping device presses the edge of the filter against the outer housing wall.

Abstract: A filter (32) is provided for a medical sterilization container (10) having a port (18,22,24) allowing fluid communication between the interior of container (10) and the surrounding environment. A peripheral frame (44) is adapted to cooperate with the port (18,22,24). A plurality of cross-members (54) span an aperture (48) formed by a frame (44). A filter medium (58) is disposed across the aperture (48) so as to be interposed between the interior of the container and the cross-members (54).

Abstract: A filter assembly of the Vee-panel type comprising a filter frame and a plurality of complementary pairs of replaceable filter panels slidably disposed within the frame and defining a plurality of adjacent Vee's with the apexes of the Vee's being disposed adjacent the air outlet end of the assembly. The filter frame defines a plurality of rectangular perimeter panel retention surfaces thereon adjacent the sides of the filter panels for retaining the panels in place and forming an air tight perimeter seal therewith. A compressible gasket is disposed about each of the panel retention surfaces.

Abstract: A horizontally mounted filter cartridge dust collector includes a housing and a plurality of filter cartridges horizontally mounted in rows on a cartridge cradle disposed inside the housing for supporting the cartridges. The cartridge cradle includes a plurality of vertical risers and horizontal tubes attached between the risers and an inner wall of the housing separating the dirty and clean air plenums. A single access door facilitates inspection and servicing of all of the filter cartridges and the entire dirty air plenum. Pairs of studs attached to the inner wall mate with corresponding grooves in the cartridge end caps to precisely locate the horizontal and vertical positions of the cartridges. Clamping mechanisms are provided to compress and seal each row of cartridges to isolate the clean and dirty air plenums. Each clamping mechanism includes a rotatable shoe for isolating the cartridges and gasket seals from torque being applied to operate the clamping mechanism.

Abstract: A respirator cartridge having a housing, a replaceable filter and a cover is provided. The cartridge is sealed by a lip on the filter frame and sealing rings on the housing and cover. The cover is releasably connected to the housing by protuberances on the cover which slide along ramp-up lock devices on the housing when the cover is turned, compressing the filter frame and sealing the cartridge.

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: An assembly is provided of a filter bowl (10), a cartridge (12) and a head (11) in which the filter bowl (10) can be removed after it has descended from the filter head (11) through a distance corresponding to only a minor part of the length of the filter cartridge (12). The cartridge (12) is a push fit into a vertical port (52) in the filter head (11). Flange (18) of the cartridge (12) and a slotted buttress (44) of the bowl (12) establish a mechanical connection between the filter bowl (10) and the cartridge (12) so that the filter bowl (10) and the filter cartridge (12) are together mounted to and demountable from the filter head (11). The filter cartridge (12) having the support flange (18) that coacts with the buttress (44).

Abstract: A modular filter assembly is described comprising a filter stack having a plurality of filter sheets and a plurality of filter support plates each having a perimeter and an internal filter flow passageway portion. The filter sheets are sandwiched between surrounding filter support plates forming the stack and the filter flow passageway portions of the plates and filter sheets are aligned to form a filter flow passageway extending from the top to the bottom of the stack. The filter stack has engaging means capable of keeping the filter support plates together while minimized top to bottom dimension because it is not necessary to use external clamps for keeping the support plates together. Also described are support plates for modular filters and a method for forming a modular filter assembly.

Abstract: A disposable filter for heating and ventilating registers wherein a supporting framework includes apertures with removable cover portions which permit selective air flow, means for securing the framework to the register or adjacent structural members and re-closable means for admitting a filter element to an interior cavity. In alternative configurations, differing filter media or replacement media may be mounted to the framework. A separately attached border trim may also be included for oversize registers. Also considered is a finish cover including means for retaining the filter to the cover and the cover to the ductwork port.

Abstract: A plastic air filter housing assembly for use in air conditioning and heating systems which includes a base member having a pair of round shape longitudinal upper and lower edges and a plurality of transverse frames having a plurality of longitudinally frames to be cross located therewith connecting member and a locking member respectively for pivotally connecting to and slidably locking with the edges respectively, whereby the air filter housing assembly is easily assembled its components and easily replacing the air filter in the air filter housing assembly.

Abstract: A filtering system for water treatment including a head member having inlet and outlet ports and replaceable, disposable filter cartridge for insertion into the head member, the filter cartridge including a dual lug retaining system for retaining the filter cartridge in the head member, one of said lug retaining systems being disposed on the pressure vessel of the filter cartridge and the other of said lug retaining systems being disposed on the closure member of the filter cartridge.

Abstract: A filter for removing micron and sub-micron molecular-sized particulate matter from a moving gas stream and comprising an enclosed filter module having a gas inlet for being connected to a source of gas to be filtered and gas outlet for discharging filtered gas from the module. A filter element is positioned in the filter module in gas flow interposed relation downstream of the gas inlet and upstream of the gas outlet in such manner that the gas must pass through the filter element in order to reach the gas outlet. The filter element comprises a multiplicity of hollow fibers each defined by a membrane wall formed of a microporous material surrounding a centrally-disposed lumen wherein filtration occurs by passing the gas from an upstream side of the hollow fiber through the membrane wall of the fibers to a downstream side thereof.

Abstract: According to the present invention, a locking means is provided for a filter cartridge and head unit. This locking means comprises a spring driven plunger, which preferably is supported by the head and comprises at least one detent, which preferably is disposed in the cartridge in the top wall upper surface thereof, whereby inadvertent disengagement of the cartridge from the head is prevented by engagement of the plunger and the detent, and whereby replacement of the cartridge is permitted by first lifting the plunger before rotating the cartridge through a requisite 90 degrees for disengagement thereof. By using the spring driven plunger and cooperating detent, the problem is avoided of a person, or a child, being able to inadvertently disengage the securing tabs from the securing tab receptacles.

Abstract: A filtering system for water treatment incorporating one or more filter assemblies each including a head member having fluid inlet and outlet ports, a replaceable filter cartridge closed at one and the other end being insertable into said head member, said head member including a manifold member and a filter cartridge supporting member operatively associated with the head member and movable relative to the manifold member between a load-unload position and an operating or running position, means for securing the filter cartridge against rotation in the filter cartridge supporting member, and seal means between the manifold member and filter cartridge supporting member for sealing off both the influent and effluent when the filter cartridge supporting member is in the load/unload position.

Abstract: The invention is directed to a venting device for admitting air into an enclosed container such as a railway car during discharge of material from the container. The device includes a securing member having an interlock for releasably retaining a replaceable filter member that is adapted to admit air into the container. The mounting member is adapted for mounting in an opening in the container member. A securing member has a one way interlook with the mounting member which may be overridden for disassembly and a releasable interlock with the filter member.

Abstract: The disclosure describes a filter assembly comprising a manifold, a filter housing, a hollow, generally cylindrical filter element disposed within the filter housing, and a mounting ring operatively associated with the manifold and the filter housing for detachably mounting the filter housing to the manifold. The manifold includes first and second ports. The filter housing includes a side wall and an end wall having first and second spaced openings and a bore. The filter element is spaced from the side wall of the filter housing and includes and end cap. The end cap is disposed in the bore of the end wall of the filter housing and has an opening which communicates with the interior of the hollow filter element.

Abstract: A ceiling fan filter comprising a housing having an air entrance and an air exit. Within the housing and intermediate the air entrance and exit is a filter medium sized to entrap airborne particles. A ceiling fan clip secures the filter to the leading edge portion of a fan blade, thereby filtering the air as it is moved by the ceiling fan.

Abstract: An air return filter or air supply grille assembly having an interchangeable perforated face plate hingedly attached directly to a molded fiberglass plenum. The molded fiberglass plenum has a preformed recess for receiving and positioning a filter resting on the face plate when used as an air return filter grille assembly. The hinge system for the interchangeable perforated face plate is comprised of a pair of mating half hinges with one half secured to the plenum and the other half secured to each interchangeable face plate. The grille assembly can be mounted and a perforated face plate selected to provide an air return filter grille assembly or an air diffusing supply grille assembly. The air filter grille assembly is constructed to mount easily on T-bar suspended ceilings with the perforated face plate held closed by manually rotatable pawls.

Abstract: A fluid filter and a method for attaching same to a filter mount of an engine in sealing relation is provided. The fluid filter includes a filter media; a housing for the filter media; complimentary interengageable locking devices formed radially on the filter and filter mount for engaging the filter and the filter mount; and a seal positioned between the housing and the filter mount. The locking devices include either: a first set of circumferentially spaced flanges formed on the inner wall of the housing and a second set of circumferentially spaced flanges formed on the filter mount; or a plurality of bolts attached to the filter mount or a plate attached to the housing and a corresponding plurality of holes formed in the plate or filter mount, respectively. The sealing means includes an annular, O-ring positioned between the housing and the filter mount.

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: An air cleaner case is installed by an attachment device on the back of an intake manifold having a plurality of branch tubes extending forwardly toward the intake ports, respectively, of an engine cylinder head. The attachment device includes upper and lower attachment arms on the air cleaner case extending substantially horizontally and upper and lower seats on the intake manifold. The upper and lower attachment arms are substantially vertically detachably coupled to the upper and lower seats, respectively. The lower attachment arms are coupled to the lower seats by vertical pins mounted on the lower seats and the upper attachment arms are coupled to the upper seats by vertical bolts. The air cleaner case can easily be attached and detached vertically even in the limited space surrounding the air cleaner case behind the intake manifold.

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: A vapor delivery pressure test adapter for integral installation at the outlet of a vapor delivery pressure regulator within a self-contained vapor delivery system, comprising a vapor pipe nipple compatible with such system, with vapor filter means internally and fixedly mounted within the nipple, and delivery pressure test adapter means externally and piercingly mounted to the nipple to permit intermittent external measurement of vapor delivery pressure within the system.