Abstract: Disposable air filter includes a filter element formed from a stacked plurality of annular disks. The disks are formed from a sorptive material and expand upon absorption of oil or water droplets. The disks are slightly compressed by a movable baffle. The baffle floats upon a stream of air entering the filter and directs the air radially through the filter element. The air flows between and through the disks with a resulting low pressure drop across the filter. As the disks expand, the baffle shifts axially within a filter housing to maintain the pressure drop across the filter element.

Abstract: A heating and air conditioning unit has a fan compartment containing a hammock-type filter. The hammock-type filter rests upon feet elevated above the bottom of the fan compartment so that air may flow into the fan through either the bottom panel of the hammock filter or either of the side panels. The front and back of channels of the bottom pannel are telescoped so that they can be expanded and always be longer than the width of the fan. Sponge rubber is provided at the front and back so that if a larger compartment is used that air leakage at the front and back is prevented by the sponge or foam rubber. The top edges of the side panels rest against the sides of the fan compartment. Foam rubber along these edges prevents noise caused by vibration as well as preventing air leakage.

Abstract: A filter assembly is removably mounted in an air conditioning unit. The assembly comprises a housing in which a filter panel is mounted. The housing includes a dust collecting box disposed beneath the filter panel. Two screens are mounted in the housing in a rolled-up condition at one side of the filter panel. The screens can be manually unrolled so as to extend across front and rear faces of the filter panel to resist the scattering of dust into the atmosphere when the assembly is removed from the air condition unit.

Abstract: An adjustable air filter for use in heating, ventilating, cooling, and forced air systems. The air filter includes a media for filtering air and adapted to be cut with scissors, and a frame embracing the peripheral edges of the media. The frame includes a pair of male sections and a pair of female sections respectively telescopingly receiving the male sections. Also, the frame is adapted to be cut with scissors and is preferably formed of polyvinyl chloride. Each of the male sections includes a T-shaped projection and each of the female sections includes a complementary shaped T-shaped slot adapted to telescopingly receive the T-shaped projection for preventing inward separation of the sections from one another. In the preferred form the media is of the electrostatic type and includes at least one layer of polypropylene woven in an egg-crate pattern. Also, the layer preferably includes a pad of washable polyester material.

Abstract: A variable air filter system is described for convection and ventilation air flows, filter elements being introduced into the air flow in order to clean or purify the room air. To obtain an improved filtering effect, provision is made for filter elements to be disposed at a distance in front of or above the air-generating surface or the air-generating cross-section, the area of such filter elements being as large as or, if required, larger than the air-generating cross-section of the air-emitting surface. It is possible to provide the filter elements with the facility of enabling different inclination, form, overall depth, and length and height arrangement to be adjusted to the optimum value for filter efficiency in the air flow for cleaning.

Abstract: An exterior filter system (10) for the housing (101) of a conventional A/C system (100); wherein, the filter system (10) comprises an elongated rectangular filter member (20) releasably secured and suspended by strap members (30) around the sidewalls (102) of the A/C housing (101) to prevent dirt and debris from passing through the intake vents (103) of the A/C system.

Abstract: A filter assembly includes a filter media unit and a frame unit. The frame unit is expandable and contractible whereby various filter media unit sizes can be accommodated. The frame unit includes a plurality of crossed legs that are pivotally connected together, and snap fastener assemblies are used to releasably attach the frame unit to the filter media unit body. Locking pivot pins can be used to attach adjacent legs together.

Abstract: The air handling apparatus provides a separate heating mixing air deck and a separate cooling mixing air deck each with their own return air and outdoor air supplies to maximize indoor air directed to the heating deck and monitor the cooling deck to utilize either return or outside air for greatest efficiency in the cooling deck. Near the rooms serviced by the system the air from the respective heating and cooling decks is mixed and directed through a control plate which can accommodate various filters including a germicide type. The control plate also has a bypass door allowing the filter to be bypassed if desired.

Abstract: A prefilter for an air main filter of an internal combustion engine such as a two-stroke engine is configured as a filter ring with the engine being especially a two-stroke engine in a handheld work tool. The filter ring defines a flow directed essentially radially inward and the prefilter has a band-like configuration and is mounted for covering the outer surface of the main filter. The prefilter includes a screen held in a flexible frame and so permits a rapid exchange thereof and is easy to clean and does not restrict the air throughput. The frame carries a part of the closure device at each end thereof lying in the longitudinal direction.

Abstract: A furnace filter and holder are presented which are capable of being adapted to any one of a number of furnace sizes as selected by the user. The holder and filter and a filter support are capable of being sized to user selected dimensions through the use of templates provided on the carton in which the components are packaged.

Abstract: A monolithic catalytic converter has a two-piece slip pin that extends through a monolithic substrate and is connected at its opposite ends to the housing so as to retain the substrate therein while freely allowing differential thermal expansion between the slip pin and the housing to accommodate thermal mismatch between these components.

Abstract: A gas filter canister housing assembly (20) capable of receiving gas filter canisters (28 or 40) of differing heights. The housing assembly includes first and second housing portions (54, 56) and holding apparatus (60) capable of holding the housing portion together. The first housing portion has a cylindrical extension (70) in which a filter canister may be disposed, and the second housing portion includes a cup-shape end portion (102) and a depending flexible skirt (100) which may be held against the cylindrical portion (70) in various positions of adjustment.

Abstract: A releasable clamping apparatus for securing cartridge filter elements to a tube sheet of a dust collector apparatus. The clamping apparatus includes a clamping band which surrounds the filter element. The tube sheet includes a plurality of spaced apart J-shaped support clips surrounding each opening in the tube sheet. A plurality of latches are attached to the clamping band and cooperate with the support clips to secure the clamping band and the filter element to the tube sheet.

Abstract: An improved fastening assembly having application for securing a filter element within an air cleaner and incorporating a novel wing nut construction. As used with an air cleaner, the wing nut is engaged with a large diameter threaded portion of a connecting bolt and acts to secure a filter element within an air cleaner housing, while an outer knob is engaged with a smaller diameter threaded section of the bolt and bears against a cover to secure the cover to a housing. The wing nut is provided with an inner threaded metal section which is molded within an outer plastic wing section. The inner nut portion includes a plastic ring having an inner diameter slightly less than the thread on the nut and serves to seal against the thread on the bolt and prevent leakage of air along the threaded connection, as well as preventing the loosening of the threaded connection due to vibration.

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

Abstract: A railway car for transporting pulverulent lading includes a fluid-tight container, slope sheets mounted within the container defining two troughs leading to a sump in the lower portion of the container, two aligned permeable conveyors in the bottom of each trough, an apparatus for alternately aerating each permeable conveyor in each trough for fluidizing the lading to facilitate movement thereof into the sump. Discharge valve structure is provided below the sump for pneumatically unloading the container pipe for pressurizing the space between the slope sheets and the container, and a pipe interconnecting the top of the container and the discharge valve structure for conveying air from within the container to the discharge valve structure during unloading of the container, are also provided.

Abstract: A filter assembly for filtering air comprises a filter housing and a filter which is removably positioned within the housing. The filter housing includes spaced-apart first and second housing portions which are connected by connecting members on opposite sides of the housing, and the filter is positioned between the two housing portions. One end of each of the connecting members is secured to the first housing portion, and the other end of each connecting member is connected to the second housing portion in a manner which permits the second housing portion to be moved along the connecting members toward and away from the first housing. When the second housing portion is moved away from the first housing portion, the filter can be removed.

Abstract: An air prefilter is disclosed for use with internal combustion engine air filters of the type having replaceable filter elements. The prefilter has a perforated sleeve connected between the usual intake openings and the filter element of the conventional air filter. This perforated sleeve is enveloped by an open-pore foam filter medium, which is of such porosity that engine intake air primarily passes therethrough rather than through the intake openings of the conventional air filter. The prefilter prevents foreign matter and water vapor from reaching and blocking the conventional filter element, which blocking causes the engine to receive insufficient air for efficient combustion. When the prefilter medium is saturated or blocked with impurities, the conventional air filter operates as usual, until the prefilter medium is cleaned or replaced. An adjustable deflector helps prevent foreign matter from blocking the prefilter medium.

Abstract: A filter for cleaning large quantities of contaminated gas, wherein the gas to be cleaned is passed through a filter medium which is spanned onto a drum. The retained contaminants are removed by a device which wipingly passes over the filter medium. The drum is fixedly connected with a conduit or line through which there is conducted the contaminated gas. The removal device comprises a compressed gas-blast device equipped with at least one jet nozzle and movable over at least part of the outer surface of the drum surrounds the periphery of such drum. The jet nozzle is directed towards the surface of the filter medium. Means serve for the withdrawal of the separated contaminants from the internal hollow space or compartment of the drum.

Abstract: An inlet screen assembly having the filter screen tensioned in only one direction when mounted on a frame which prevents distortion of the filter screen openings and which may be used to filter extremely fine solids from the influent. The screen assembly provides a large flow capacity with a minimum pressure differential that may be used in any type intake facility and is suitable for use in either a stationary or movable screen water intake facility.

Abstract: An air filtering unit includes a generally rigid, affixed framework having an inwardly extending planar flange defining an opening. A box-like filter cartridge has a lower edge surface adapted to seat on the framework flange. Means are provided for securing the filter cartridge in position on the framework. Such securing means include at least two opposing adjustable fastening means, each of which includes an elongated strap attached to its lower end to an outer wall portion of the framework and extending outwardly a distance greater than the height of the filter cartridge. A bracket, having a slot which matches the strap so as to be slidable thereon, is mounted on the strap and adjustable means are mounted on the strap outwardly of the bracket and movable along the strap into forcing engagement with the bracket to urge the filter into engagement with the framework.

Abstract: A fiberglass bag filtering unit adapted for use in filtering gaseous streams containing suspended solid particulates wherein a reverse flow of compressed air is utilized during the cleaning cycle, said unit featuring the advantage of being conveniently adjustable to provide a requisite degree of cloth tension without causing excessive stress conditions to occur at any part of the bag where retained by the support elements of the unit.

Abstract: An adjustable tensioning and retaining device particularly well suited for supporting a filter bag in a gas filtering baghouse includes an elongated linking member interconnected to one end of the filter bag, a wedge shaped body member having a sloping top surface with a plurality of spaced apart indentations formed in this sloping top surface, and coupling means for removably connecting the linking member into any of the indentations in the body member. In addition, the wedge shaped body member is mounted to a supporting structure in the filtering baghouse for linear movement such that the plane of the sloping top surface of the body member is inclined to the direction of linear movement.

Abstract: A filter unit having a central member of substantially rectangle cross section and made up of one or more interconnected sections and having ends slidably fitting into end members of the same cross section. The central member is formed with ventilating apertures in front and rear walls thereof through which air can flow, and a filter medium is positioned in each section so that the air must flow therethrough. Filler strips are formed on and extend the length of the upper and lower edges of the central member and slidably fit in slots in the upper and lower edges of the end members so that said unit has continuous upper and lower edges in common upper and lower planes and extending the length thereof.

Abstract: There is disclosed a ventilator for use with windows, doors, or other building hardware. The ventilator includes an inner plate having air vents and an outer plate spaced apart from the inner plate in the transverse direction of the ventilator and providing an opening displaced from the air vents. Provided between the inner and outer plates are a filter and a partition extending from the inner plate toward the outer plate until it abuts against the filter. The partition is adapted to direct a flow of air from the opening to the air vents at least twice through the filter. The ventilator is prefabricated as a unit and is easily installed within the windows, doors and the like.

Abstract: A ventilator, constructed to serve as a horizontal rail in a building component, includes a pair of spaced apertured plates, the aperture of one being an air inlet vertically spaced below that of the other which is an air outlet, and filter and baffle means disposed in the path between said apertures, and so arranged that an air current flows through the filter at least twice.

Abstract: An air filter unit to be installed in the wall of an air conveying conduit for filtering air as it passes between the conduit and a room includes a frame to mount a flow-through filter over an appropriate aperture in the conduit wall, a gasket between the filter and frame, a gasket between the frame and interior surface of the conduit wall, a frame collar disposed around the periphery of the frame, a clamp which causes the frame and collar to coact in a vice-like manner forcing the frame against the interior wall surface of the duct compressing the gasket therebetween, and a clamp for holding the filter in the frame. The filter unit may further include a pivotally mounted extractor plate disposed inside the conduit to selectively direct a predetermined amount of air through the filter.