Abstract: A centrifugal air cleaning apparatus includes a housing defining a filter compartment containing a generally tubular filter cartridge having the open upper end thereof in communication with an air outlet opening through the top wall of the filter compartment. A vacuum source is provided in communication with that air outlet opening to effect vacuum pressure within the filter compartment. An air inlet opening through a side wall of the filter compartment has a multi-baffled flame arrestor associated therewith for extinguishing sparks in the fumes being drawn into the filter compartment and for directing the incoming air flow tangentially of the filter cartridge so that a portion of the pollutants carried in the fumes are separated by gravity before the fumes contact the filter cartridge. An injector conduit is provided within the flame arrestor to facilitate blowdown.

Abstract: This low-profile filtration module has a blower partially occupying an equalization chamber above a standard filter unit. A diffuser plate is interposed between the filter and the equalization chamber, and has a plurality of openings elongated in a direction perpendicular to the planes of the filter pleats. The density of the openings is increased at the portions of the equalization chamber where the space for lateral air flow is decreased by the presence of the blower.

Abstract: An indicator for indicating values of a variable condition being measured, as for example in a portable air cleaner having replaceable filters subjected to particulates in the air. The indicator is provided with an indicia scale marked off in uniformally spaced graduations with shading between the graduations being non-uniform and proportional to the condition being measured.

Abstract: A system of localized low velocity laminar air flow in a recirculation path through filtering mechanisms for removing dust mites, waste and other particulate contaminants from the stream of air. That stream of air has a downwardly directed external portion in which a patient's head (particularly its mouth and nose) is adapted to be received.

Abstract: This invention relates to a central suction-cleaning installation with water flushing and double rinsing. This installation is characterized in that it contains water flush generating means consisting of a water intake at the bottom end (5) of the chamber (7) via a duct (25) linked to a source of pressurized water (20) and in which there are interposed an electrovalve (26) and a needle valve tap (27) controlled by a float (28) which is arranged inside the chamber, above a reserve of water (13), in that the chamber is further provided with a double rinsing system containing, on the one hand, a diffuser ring (31) directed at said reserve of water and, on the other, a spray diffuser (32) of a dust filter (35) placed between the suction plant (34) and said diffuser ring (31), whereby the ring and spray diffusers are linked to said source of pressurized water via a duct (29) which is provided with an electrovalve (30). This invention is useful for applications in central suction-cleaning.

Abstract: A water generating device for obtaining potable water from ambient air inside or outside a structure or dwelling, having ducts for bringing this supply of ambient air to the device and for releasing the air back outside the device after it has been processed. There is an air filter for filtering the air prior to processing of the air. The air filter includes a one-time sensing element which renders it unusable when removed from the generator. A condenser is provided for extracting water vapor in the air brought thereto by the ducts. Within the ducts there is a fan or blower to move air from outside the device through the condenser and for returning the air back outside the device after it has traversed the condenser.

Abstract: A clean air room for a semiconductor factory includes a plurality of clean air boxes placed in side-by-side relation and each designed for its own processing step, an air conditioning equipment including a fresh-air regulator for controlling a supply of fresh-air to the clean air boxes, and fan filter units for supplying the air under pressure, the clean air boxes having clean air chambers of which environment is maintained to a predetermined degree of cleanliness in response to the fan filter units and defining an air circulating path extending through the clean air chambers, the clean air chambers including low clean air chambers and an ultra clean air chamber divided by common side walls of the clean air boxes, the low clean air chambers having operating zones and the ultra clean air chamber having a transfer robot therein, and semiconductor processors extending through the common side walls and having processing stations, the processing stations being located at least within the ultra clean air chamber.

Abstract: A separator for use in connection with a liquid bath-type vacuum cleaner system. The separator includes an annular, cup-like housing adapted to rotate axially about its vertical axis for generating a centrifugal force to be applied to intake air therein; and a plurality of intake/exhaust slots particulates entrained in the intake air and liquid particulates from a liquid bath to be drawn into an interior area of the housing and coalesce therein, whereby the coalesced particulates are subjected to centrifugal force and are thereby separated from the intake air. The intake/exhaust slots further enable the coalesced particulates to be forcibly expelled from the interior area of the housing therethrough as they are forced radially outwards by the centrifugal force generated by the rapid, axial rotation of the housing.

Abstract: A multi-compartment vacuuming machine which maintains a high flow rate capacity and low resistance from obstructions in the flow path through arrangement of the multiplicity of vacuum canisters in parallel so that obstructed flow in one filter canister will not impair the flow through the remainder of the filter canisters. The flow path of the dirty fluid is arranged such that there is a straight line from the dirty fluid to the most distal filter canister so that the most distal canister fills up first and then intermediate filter canisters are filled. The transverse path leads from the main dirty inlet flow tube to the various filter canisters. In the preferred embodiment, the canister inlet flow tube to each filter canister is generally perpendicular to the dirty air inlet tube and the vacuum suction motor is remote from the most distal of the canisters.

Abstract: Improved techniques are provided for improving the environment of hazardous material abatement personnel operating within an enclosed working area while conducting, for example, asbestos removal operations. A negative pressure is established within the working area by a portable air moving unit, which exhausts air from the working area to prevent hazardous material leakage. The exhausted air is filtered, a significant portion of the exhausted air is conditioned by a portable refrigeration, heating and dehumidification system, and the temperature controlled air is returned to the working area. An air diverter is provided for regulating the ratio of the discharged air to the returned and conditioned air in response to the sensed pressure level within the working area. The temperature of the working area is regulated, thereby substantially increasing worker productivity and reducing safety risks.

Abstract: A dehumidifier for removing moisture contained in air upon discharging the air which has been introducing from outside, comprises a container body, a meshed receptacle which is suspended through a receiving mouth formed on top of the container body and accommodates therein a deliquescent moisture absorbent, and a cover which covers the top end of the container body excluding the receiving mouth. On the top end of the container body, there are provided a receiving tube which is suspended therein and the bottom portion of a battery chamber. In the cover, there are provided an air sending tube which forms a vent passage together with the receiving tube being located within the receiving tube and is suspended lower than the receiving tube and a cover which forms the battery chamber together with the bottom portion of the battery chamber of the container body. Further, on the top of the air sending tube, a fan and its driving source are provided.

Abstract: A vacuum cleaner comprising a dust receiving container having an aperture for connecting a suction hose and an opening at the top for releasably supporting a motor-fan unit. A frame surrounding the container is provided with a vertically sliding structure for raising the motor-fan unit above the container at a distance sufficient to allow the container to be withdrawn sideways below the motor-fan unit. The motor-fan unit includes a dust filter, which when raised above the container, can be cleaned while allowing the dust to fall in the container.

Abstract: Office machines, such as electrostatographic reproducing machines, laser printers, and facsimile machines, utilize corona discharge devices, which generate ozone. Some electrostatographic reproducing machines include a film belt arranged in a look having a plurality of such ozone generating corona discharge devices positioned therearound. In order to remove ozone from these machines at the locations where such ozone is generated, an ozone collection system is provided in which each corona device has a hood in proximity therewith connected by a hose to a manifold. The manifold is, in turn, connected by a hose to an ozone-removing canister which includes an air suction pump, a plenum, and an annular filter of activated carbon. The suction pump pulls airstreams into the hoods, which airstreams entrain ozone from proximate each corona device.

Abstract: A vacuum cleaning apparatus is provided having a canister, a motor mounted to the exterior of the canister, a cyclonic cone centrally disposed within said canister, an inlet port in the canister wall opposing the cyclonic cone, an outlet port above the cyclonic cone and a primary filter within the canister between the lower end of the cyclonic cone and the canister bottom wall. When the motor pulls air from the canister through the outlet port, dirt laden air entering the inlet port passes the cyclonic cone and downwardly spirals around the cyclonic cone and passes through the primary filter. The filtered air is then pulled upwardly through the interior of the cyclonic cone and exits through the outlet port. A secondary filter can be interposed between the outlet port and the primary filter for additional air filtration.

Abstract: A self-contained, portable spot abatement unit (10) facilitates the spot removal or abatement of asbestos material, or other material containing particulate contaminants. The unit includes a portable work chamber (12) having vacuum (VP1, VP2) and filtration (F1F2) means coupled thereto for establishing a negative air pressure therewithin. The unit has overall dimensions that permit easy passage through conventional door openings, yet the work space provided within the work chamber is sufficiently large to allow a worker to perform whatever tasks need to be performed at a desired work site. A first telescoping top frame (20, 52) allows the work chamber to expand in order to contact finished ceilings up to 13 feet from a finished floor. A second telescoping frame (22, 56) used in one embodiment, allows the work space to be further extended, e.g., to pass through an opening (54) in a finished ceiling up to 18 feet from the finished floor. A hand-held collection bag (144) may also be used within the work chamber.

Abstract: A vacuum filter vessel having a base and a source of vacuum. There is an inlet for dust laden air and a mainly imperforate container to receive dust. The inlet and the source of vacuum communicate with each other by a passageway extending around the container to communicate the top of the container and the vacuum source. There is a perforate filter member at the top of the mainly imperforate container to filter dust from the dust laden air.

Abstract: A vacuum cleaner for simplified dirt disposal is described, having a dirt collector with a cover, a motor and turbine disposed on the cover and a filter below the turbine extending into the dirt collector, where the foil bag is removed from the dirt collector after the cover has been removed. It is intended to simplify to a considerable degree dirt disposal as far as cleaning of the dirt collector as well as changing of the filter is concerned. This is attained in that the dirt collector is covered on the top by at least one filter support plate inserted into the dirt collector, fasteners for the foil bag to be inserted into the dirt collector being disposed on the circumference of the filter support plate and, furthermore, in that the filter support plate has an annular opening, through which the upper portion of the filter extends and is sealingly maintained on the motor housing of the dirt collector.

Abstract: A separator for use in connection with a liquid bath-type vacuum cleaner system. The separator includes an annular, cup-like housing adapted to rotate axially about its vertical axis for generating a centrifugal force to be applied to intake air therein; and a plurality of intake/exhaust slots formed in the housing for enabling dust and dirt particulates entrained in the intake air and liquid particulates from a liquid bath to be drawn into an interior area of the housing and coalesce therein, whereby the coalesced particulates are subjected to centrifugal force and are thereby separated from the intake air. The intake/exhaust slots further enable the coalesced particulates to be forcibly expelled from the interior area of the housing therethrough as they are forced radially outwards by the centrifugal force generated by the rapid, axial rotation of the housing.

Abstract: Improved techniques are provided for improving the environment of hazardous material abatement personnel operating within an enclosed working area while conducting, for example, asbestos removal operations. A negative pressure is established within the working area by a portable air moving unit, which exhausts air from the working area to prevent hazardous material leakage. The exhausted air is filtered, a significant portion of the exhausted air is conditioned by a portable refrigeration, heating and dehumidification system, and the temperature controlled air is returned to the working area. An air diverter is provided for regulating the ratio of the discharged air to the returned and conditioned air in response to the sensed pressure level within the working are. The temperature of the working area is regulated, thereby substantially increasing worker productivity and reducing safety risks.

Abstract: A filtering device for removing liquid particles from air streams of air compressors comprising a housing with an open side of which the interior is partitioned into three successive compartments, a lid which seals the housing, two filter layers which are constituted by a perforated plate and a filter sheet made of suitable filtration material, and a vane-type impeller which is rotated by the pressurized air from an air compressor to help moving the air through the filter layers. Between any two successive compartments, an air passage is formed with one of the filter layers fixed therein to remove liquid particles, such as water and oil particles. The removed liquid will be stored in reservoirs and then drained off.

Abstract: A supplied air respirator system is described for use in an enclosed work area wherein an asbestos abatement action is being conducted. A conventional air filtration unit is provided and which has its discharge side in communication with a clean air box. Positioned within the clean air box is a HEPA filter intake box having a HEPA filter contained therein with the discharge side thereof being connected to one or more air pumps. The discharge side of each of the air pumps is connected to an air cooler or heat exchanger coil unit, filter system and hose reel assembly. The heat exchanger coil unit cools the compressed air with the filter systems positioned downstream thereof being utilized to remove any excess condensation from the cooled air.

Abstract: An apparatus for removing contaminants generated in a volume of air contained within a work structure includes a housing, an inlet aperture disposed in the housing for receiving the contaminated air generated in the structure, an outlet aperture for passing of filtered air disposed in another portion of the housing removed from the inlet aperture and a plurality of removable interchangeable filter units disposed in the housing in spaced relationship between the inlet and outlet apertures thereby forming a plurality of chambers each defined by adjacent filter units and the housing. A detector device is engaged with at least the first chamber adjacent the inlet aperture for detecting the level of concentration of contaminants in the air passing through the chamber.

Abstract: An air filtration system for removing smoke and grease from cooking exhaust of ducted range hoods is disclosed. In particular, the system includes a coarse filter device fine filter device which substantially remove all of the cooking effluents from the cooking exhaust drawn into the system by a fan powered by a variable speed motor. A sail switch device is connected to the motor and is positioned in the system to determine the flow quantity of the air drawn into the system and to maintain this flow quantity at a substantially constant volume by controlling the speed of the motor device. A maximum speed of the motor is determined by an indicator device signaling an operator to change filters clogged with cooking particles.

Abstract: A vacuum cleaning system having a receptacle of non-porous material, such as a plastics bag (65), adapted to safely receive and hold hazardous material such as asbestos fibre. Vacuum is applied by a fan (86) to a suction chamber (69) and then through a filter (71) to an intermediate chamber (63) and via a suction pipe (61) to the bag (65). Waste material is sucked into the bag through an inlet pipe (67). The filter is cleaned periodically by admitting atmospheric air through a pulse valve (74) causing an inrush of air through the filter (71) and into the bag (65), cleaning the filter and intermediate chamber (63).

Abstract: This air filtration module has a rectangular housing separated vertically by a horizontal partition into upper and lower chambers communicating through a central opening in the partition panel. The lower chamber provides for distribution of air flow over the tops of filter units supported by the module below the distribution chamber. A blower is mounted at one end of the upper chamber, which discharges high-velocity air past the central opening in the partition panel, and into an opposite end of the upper chamber, where the velocity energy is converted to some degree to a lower velocity pressure energy. A ring surrounding the central opening above the partition panel stiffens the panel, and also provides support for an adjustable damper. The air intake through the module is drawn in by the blower through a preliminary filter in a frame horizontally opposite a bridge structure across the top of the module that supports the control devices associated with the blower.

Abstract: A portable filter device provides a substantial mass of particulated charcoal distributed in a horizontally orientated lenticular configuration across a horizontal orifice to provide substantially uniform filtration properties over the orifice area. The filter device is releasably assemblable to allow change of particulated charcoal for replacement or modification and optionally to provide for use of a second supplementally associated mechanical filter. A casement defines an internal plenum that carries a squirrel-cage type fan that draws air through the filter, acts as an equalizing reservoir, and provides space for optional sorbefacient materials.

Abstract: A vacuum machine for collecting hazardous materials is adapted for wet or dry applications without diminishing the storage capacity of the reservoir.

Abstract: An improved gas and odor absorbing unit. The unit comprises a container having a bed of particulate odor and gas absorbing material therein constituting a molecular sieve. A tubular passage extends through the container and bed and is provided with a perforated peripheral wall adjacent the bed. The bed is fully enclosed except at the perforated tube wall. Air containing moisture, gases and odors is directed through the tubular passage. The molecular sieve bed has an affinity for gases and odors and an affinity for moisture as well. By directing the air through the tubular passage, rather than directly through the bed itself, more of the gases and odord and less moisture will be absorbed by the bed, increasing the working life of the bed. This effect may be further improved if the tubular passage is provided with diffuser material such as baffles, polyester, or fiberglass to slow down and disperse the air passing therethrough.

Abstract: A paint spray booth with a filter and means within the spray booth to incinerate paint from the filter. A filter particularly adapted for collecting paint overspray in a paint spray booth. The filter has a plurality of members with a first portion parallel to the path of the air and paint particle flow which is to be filtered, each of the members having a second portion extending normally in a first direction from the downstream side of the first portion. The second portions of the members are spaced from each other and form openings therebetween on a plane normal to the flow of air and paint particles. Each of the members has a third portion extending from the other side of first portion and in the opposite direction from the second portion, and the third portions of the members form slots between members with areas less than the area of the downstream openings.

Abstract: A method is described for spraying toxic chemicals onto agricultural plants that produces only a small amount of contained drift and then removes this drift from the air polluted.The environment is not badly damaged, less toxic chemical is used, the probability that a user will injure anyone with toxic spray drift is reduced and spraying work is made more tolerable.

Abstract: An electric vacuum cleaner having a chamber arranged above the motor housing to receive a filter bag the side of which facing the motor housing is in valve-closed socket-connection communication with the fan-air channel and which can be removed from the chamber after opening and separating the socket connection. The filter bag is in socket-connection communication with a filter-bag intermediate support which is carried along upon the swinging open of the chamber and which has the valve-closure member and from which the filter bag can be separated somewhat on the other side of the vertical position of the cross-sectional plane of the socket connection.

Abstract: A liquid bath vacuum cleaner includes a housing having an assembly for cleaning air. A cap assembly is operably connected to the housing. An inner canister is positioned within the cap assembly. A motor is mounted within the canister for rotating the assembly for cleaning air. The cap assembly includes an inlet for enabling ingress of cooling air into the cap assembly and an outlet for enabling egress of cooling air from the cap assembly. A motor cooling fan is connected to the motor for drawing cooling air through the inlet and for exhausting the cooling air radially from the motor cooling fan to cool the motor and exhaust the cooling air through the outlet.

Abstract: An air driven filtration system is disclosed. The system includes a power module housing, an air driven motor and a removable filter pack. The power module is adapted to receive an intake adapter for connecting a remote filter pack thereto which may be placed in a contaminated work area. The remote filter pack is connected to the power module by flexible ducting.

Abstract: A facial air cleaner adapted to remove airborne particles in the vicinity of a person's face prior to insertion of contact lenses to eliminate the airborne particles from being deposited on the contact lenses during insertion. The cleaner is an enclosed unit which has an air inlet driven by an electric fan and conduit connected to the inlet adapted to provide a pattern of high and low velocity air flow through outlets arranged to surround the face and gently flood the hand holding the lens with cleaned air while a lens is being inserted.

Abstract: A self-contained air monitoring unit with agitated air capability comprising a cabinet having an air pump compartment provided therein into which is furnished filtered air. A blower is provided in the cabinet for drawing air inwardly through the air intake of the cabinet through the air pump compartment and outwardly through a port at the rearward end of the cabinet. An elongated flexible hose may be secured to the air outlet on the cabinet to agitate the air within the space in which an asbestos abatement action has been conducted. A plurality of air pumps are located within the air pump compartment and have their intakes operatively connected to an air sampler located within the space in which the asbestos abatement action is being conducted. During the asbestos abatement action, the air pumps in the air compartment are contained in a clean environment and are cooled by air passing thereover.

Abstract: A portable and mobile multi-stage filtering system is disclosed capable of filtering particulate of the size of one micron. An external canister filter capable of filtering down to at least 0.5 microns is connected to and located external to the cabinet of the airtight filtering system. The cabinet contains a centrally located high speed motor driving a high capacity vacuum pump completely surrounded by thermal and acoustical insulation. The air filtering path includes a plurality of baffles defining a serpentine path for exhausting the air into a series of plenums of increasing volume which communicates with a ULPA filter capable of filtering down to 0.12 micron. The plenums are also surrounded by acoustical and thermal insulation which has the effect of lowering the noise of the filtering system and increasing the efficiency of the total system.

Abstract: A filtration device for filtering airborne contaminants, such as airborne asbestos fibers, from the air, including a housing having an inlet for receiving contaminated air, an outlet for expelling filtered air outside of the housing, a filter, including a HEPA filter, in sealed communication with the inlet, and a blower within the housing for drawing air through the filter means and for expelling the filtered air through the outlet to the outside of the housing. A control and display system continuously senses differential air pressure within the housing and blower speed, converts the differential air pressure and blower speed to an air flow rate value and displays the air flow rate through a display unit. Manually controllable key pad switches are provided to selectively change the desired air flow rate, to set upper and lower pressure limit values, and to set the operating time for the system operation.

Abstract: A controller is associated with a cabinet which contains apparatus and components for performing operations or conducting processes. Associated with the cabinet is a housing within which is contained an air filtration material. Air is admitted and propelled for flow through that material and delivery into the confined space defined by the cabinet by a blower unit. The blower unit is controlled in response to the rate of flow of air through the housing in order to maintain a selected rate of flow in compensation for changes in impedence to flow of air through the material. Operation also is controlled in response to other parameters, such as pressure differential across the material, pressure differential across a prefilter upstream, a measure of the rate of air flow into the cabinet, ambient temperature within the cabinet, pressure differential between outside atmospheric pressure and each of the housing and the cabinet and relative humidity within the cabinet.

Abstract: A multi-part cabinet enclosing a high efficiency particulate air filter and a blower for moving air therethrough positions the filter in a first part of the cabinet and sealingly connects it with a second part of the cabinet in which the blower and its motor are located. A third part of the cabinet encloses the first part and provides a screened access opening so that air to be filtered can enter the third part of the multi-part cabinet and flow therefrom through the high efficiency particulate air filter in the first part of the cabinet and from the filter into the second part of the cabinet and the blower therein, the second part of the cabinet being provided with a screened air exit, the first part of the multi-part cabinet being permanently sealingly attached to the second part of the multi-part cabinet. The interconnection of the first, second and third parts of the multi-part cabinet positively prevent air leaks which adversely affect the efficiency of the high efficiency particulate air filter.

Abstract: Apparatus for filtering impurities from the air of a room and recirculating its including a cabinet in which a motorized blower unit functions to intake room air and blow its through a filter unit into an upper compartment or the cabinet from where it escapes through multiple vents in the cabinet to recirculate in the ambient atmosphere of the room.

Abstract: A room air treatment system in which air is drawn through a large particle prefilter, a first carbon filter, a second dual honeycomb matrix carbon filter in which the honeycomb cells in adjacent matrices are offset relative to one another, a blower mounted on vibration isolation mounts and is expelled by the blower into a plenum from when it exits upwardly through a fine particle HEPA filter and finally out through a final filter which is a combination fine particle filter and carbon filter. A filter change warning system is provided which includes a 3500 hour filter change indicator, an every 7000 hour filter change indictor, a back-up warning indicator, a mute button for muting the warning indicator and a recycle system for restarting the hour count.

Abstract: A cyclone dust collector is comprised of a lower dust chamber (5) having a tangential air inlet (10) and an upper dust chamber (4) in combination with a suction device. A dividing plate separates the upper and lower dust chambers from one another. A communicating duct (2) is installed in the dividing plate (3) in such a manner to extend downward into the lower dust chamber (5), and a cyclone drum (15) is supported in such a manner to enclose the dust (2). A disk (17) is supported to vertically divide the inside of the drum (15) into a pair of upper and lower parts. The air introduced into the lower dust chamber (5) is caused to flow in a swirl in the cyclone drum (15), the dust particles in the air are separated by centrifugalization to be allowed to drop along the inside wall of the drum (15) and the separated dust particles fall onto the bottom of the cyclone drum (15) without being affected by the swirling flow.

Abstract: The invention concerns a central vacuum cleaning system for vacuum cleaning ducts permanently installed in buildings. The device has three connected sections which form the integral unit. The top section contains the suction turbine, its motor and an exhaust outlet for clean air. The center section contains air baffles, a perforated circular conduit below the air baffles and for dispersing water, an angled inlet conduit for dust-laden air, and a water level sensor. The bottom section contains a water outlet, a flexible sleeve valve, the outlet end of the angled inlet conduit from the center section, a water reservoir with a water level above the outlet end of the inlet conduit and substantially even with the water outlet, and a drain plug. Dust-laden air bubbles through water in the reservoir. The dust-containing water is automatically flushed by electronic control circuitry coordinating the filling and evacuation sequence.

Abstract: A portable dust collector which includes a housing having a dust-proof chamber, a motor and blower enclosed within the chamber, a centrifugal blower driven by the motor and exhausting through a diffuser into the housing, a filter bag enclosing the top of the housing, a collection bag enclosing the bottom of the housing, and a support extending downwardly from the housing to the base for providing clearance below the housing sufficient for the collection bag. By positioning the motor within a dust-proof chamber inside the housing, the dust collector has better balance and portability and requires less floor and storage space than prior art collectors with exterior motors. The collector also includes a diffuser which is attached to the blower outlet and is shaped to direct the effluent from the blower downwardly into the collection bag.

Abstract: A clean room is adapted to provide a plurality of clean air zones with different degrees of cleanliness. Air is passed through high efficiency particulate air filters in the ceiling of the room and withdrawn through shutters in the floor of the room. The shutters are adjustable to maintain a pressure-balanced system. The room is divided by walls and partitions to define different zones which are filtered by different classes of filters depending on the degree of cleanliness required in each zone.

Abstract: A clean room having an air-conditioner unit built in the shell of an airtight main room in such a manner as to form part of the internal wall of the main room. This air-conditioner unit is provided with an external casing of a small thickness and this external casing is provided with an air inlet and an air outlet which is fitted with a high-performance filter. The casing has an air blower disposed therein. The airtight main room is mainly formed of a plurality of gate-shaped frames disposed in parallel as regularly spaced on a floor surface. The air-conditioner unit and a control unit are disposed in the spaces intervening between the adjacent vertical members of the gate-shaped frames. The internal wall of the main room is formed of wall panels and the front panel of the casing of the air-conditioner unit.

Abstract: The present invention discloses a liquid bath vacuum cleaner having a cooling air stream separated from its cleaning air stream to improve the cooling efficiency of the vacuum cleaner. The separation of the air streams accomplished by a construction comprising a pan assembly, a baffle member detachably connected to the pan assembly, a main housing detachably connected to the baffle member, a cap assembly connected to the housing, a motor assembly mounted within the cap assembly including a drive motor, a separator for drawing cleaning air into the vacuum cleaner, and a sealing mechanism to form a cleaning air cavity or pathway through the vacuum cleaner and a separate cooling air cavity for cooling air for the drive motor.

Abstract: A hollow wing and duct for passing air containing contaminants from the top discharge opening of a high speed paper-handling machine in a computer room, such as a laser printer, and delivering the air to a filtering media which filters the air for recirculation in the computer room. The wing has an internal baffle arrangement which improves air flow through the wing.

Abstract: A device for removing particulates from a gas stream includes a receptacle and a duct assembly located at least partially within the receptacle. The duct assembly has an inlet duct communicating with a first velocity-reduction zone which includes first and second ducts branched from the inlet duct. The assembly also includes a second velocity-reduction zone communicating with the first zone and with a chamber, the second velocity-reduction zone includes a branched third and fourth ducts branched from a duct of the first zone.

Abstract: A gas particulate filter system is provided for supplying clean heated air o an operator subjected to ambient environments containing nuclear, biological or chemical contaminants. The filter unit includes replaceable radial flow canister means, centrifugal blower/heater means, continuously variable electronic control means for regulating air temperature and air flow, and clamping means for easy assembly of the components under adverse field conditions.