Abstract: An atomizing board includes a board surrounded by a peripheral frame that is configured to allow stacking of two atomizing boards. The board includes a number of atomizing holes defined therein. A periphery that defines each atomizing hole includes an annular upper wall extending upwardly therefrom and an annular lower wall extending downwardly therefrom. The atomizing holes are arranged in the board in a manner that they are asymmetrical to a central transverse axis of the board such that in two stacked atomizing boards consisting of an upper atomizing board and a lower atomizing board, one of the lower atomizing board and the upper atomizing board is in a status that is rotated through 180.degree. or turned upside-down relative to the other of the lower atomizing board and the upper atomizing board, and each atomizing hole on the upper atomizing board is partially aligned with at least one of the atomizing holes of the lower atomizing board.

Abstract: A ventilator hood for a stove includes a separator, a housing having a back plate, a top plate and two side plates and an inlet formed by an inclined bottom plate and a hood. A passage is defined between the hood and the inclined bottom plate. A guiding plate is attached to the hood and has a groove defined therein. A W-shaped screen is attached to the guiding plate in the passage. The inclined bottom plate and the back plate form the separator having a drain hose, an oil hose and an inlet hose attached thereto. The inlet hose includes at least one branch with each having a nozzle attached thereto. A deflector plate corresponding to each nozzle is attached to the groove in order to form a water curtain when the water spouts from the nozzle.

Abstract: This invention relates to a cooking enhancement system for retarding excessive flame and creating a burst of spray to steam a product being cooked with an automatic means for distributing water onto an excessive flame activated by a photodetector that senses light from the excessive flame.

Abstract: An exhauster for cooking includes a cooking smoke suction port disposed at the rear of a gas range on a cooking table, a vertical downward pipe with one end thereof connected to the suction port, an empty box connected to the other end of the downward pipe, the empty box having a cross-sectional area larger than that of the downward pipe, and a sirocco fan connected to the empty box, the exhaust port of the sirocco fan communicating with the outdoors.

Abstract: A commercial and institutional kitchen retrofit system for 1. the automatic daily cleaning of commercial kitchen exhaust hoods and flues, 2. a low pressure, low volume, recirculating cleaning system designed for the removal of oily residue from hard surfaces and the accelerated bioremediation of the resulting collective hydrocarbon waste, 3. the collection and elimination of roof-top grease accumulations, 4. the systematic on site incubation and enhanced propagation of cultured, hydrocarbon specific, bacterial microorganisms in an automatically mixed aqueous solution containing PH neutral oxidizers and hydrocarbon base emulsifiers altogether, producing a regenerative, recyclable cleaning solution specifically developed for use in 5.

Abstract: A system for degreasing the interior surfaces of kitchen exhaust ventilation ducting includes a number of nozzles connected to piping disposed interiorly and longitudinally to the ducting by a framework. The nozzles are supplied by a high pressure pump through the piping and direct a stream of high velocity fluid against the interior surface of the ducting. Selective operation of the nozzles preferably minimizes pump capacity. Sequencing of selective nozzle operation from top to bottom preferably produces a rolling cascade of high velocity fluid directed against the interior surface of the ducting. The resulting effluent is readily collected from the lower end of the ducting and disposed of in any manner desired.

Abstract: The invention aims to achieve a strong low-noise exhaust from a smoke collecting hood disposed right above a gas range on a cooking table through a piping in a ceiling in a high-rise apartment house or a detached house. The cooking table is provided on a floor, and the smoke collecting hood is disposed right above the gas range placed on the cooking table and is connected to the piping in the ceiling. The piping is connected to one side of a box-like hollow member provided on an outer surface of an external wall of the house, and a drawing port of an exhaust blower is connected to another side of the box-like hollow member so that the space through which the piping and the drawing port face each other is maximized. The box-like hollow member is formed so that its inside diameter is larger than the inside diameters of the drawing port and the piping.

Abstract: A ventilator hood includes a hood body having a first lengthwise wall, a second lengthwise wall, and a bottom wall. A bottom plate extends from a lower portion of the second lengthwise wall. A supporting plate extends upwardly from the bottom plate. An upright plate extends downwardly from the bottom wall, and an inlet opening is defined between the upright plate and the supporting plate. A spraying device includes an L-shaped plate having a vertical section extending downwardly from the bottom wall. A baffle extends upwardly from a horizontal section of the L-shaped plate and a space is defined between the L-shaped plate and the baffle. A passage is defined between the baffle and the upright plate. A wiper plate extends downwardly from a lower portion of the baffle and a channel is defined between the wiper plate and the supporting plate.

Abstract: The exhaust hood assembly has a vertically disposed greast extractor which leads into a suction ventilator adapted for expelling air and odor to the outside. The assembly has a first deflector at the entrance into the grease extractor to cause a first swirl of the air loaded with grease, impurities and odors, and a first release thereof into a bucket provided below the greast extractor. Inside the greast extractor there are two deflectors to cause swirls of the air load with grease and odor and release of grease and particles into the bucket. Finally, any grease and/or impurities not released in the grease extractor are centrifugally expelled by the suction ventilator and sent through a tube which also feeds into the bucket. This device is inexpensive to produce and is much more efficient than those currently in use.

Abstract: A range hood having a sleek, modern appearance has a keypad and control circuit which enable adjustment of fan speed and light intensity. The range hood includes a keypad having a linear array of keys which may be individually or collectively used to energize the fan at one of a variety of speeds. A control circuit responds to depression of one or a group of two of the keys and in response selects one of a plurality of possible fan speeds. The array of keys is also used in conjunction with a separate night light key to program the intensity of the light for use as a night light. An automatic shutoff key is used to gradually reduce the fan speed until, ultimately, the fan is deenergized.

Abstract: A stove hood with filters which may be flushed clean when desired, the hood having a roof, end members and a bottom trough which define at least one rectangular opening through which stove gaseous medium passes through a filter upward to an exhaust duct. A closurable member is provided for each rectangular opening and within the hood volume is provided a spray head directed to each filter and supplied with cleaning fluid under pressure when brought into the spray head via a conduit upon activation of control means. The fluid which is passed through the filter or filters is caught in the trough and discharged either into a sewer line or recycled for return cleaning of the filters.

Abstract: Ventilation ceiling, comprising channel elements running at a distance from and parallel to each other, and ceiling panel elements leading with their side edges into the channel elements, which chapel elements are in fluid communication with a fluid-collecting element, while the panel elements serve the purpose of extracting grease and/or livid constituents from the air, and the channel elements serve the purpose of conveying the extracted grease and liquids to the fluid-collecting element, and a fixed supply line for cleaning agents provided and serves the purpose of dispensing cleaning agent into the channels at intervals.

Abstract: An oily smoke atomizing device includes a housing, a passage defined in the housing and having a first end in fluid communication with an inlet of the housing and a second end in fluid communication with an outlet of the housing, and a plurality of atomizing plates mounted in the passage. Each atomizing plate includes a plurality of first tubes and a plurality of second tubes to define an oily smoke passage. Oil contained in the oily smoke is separated into oil particulates when passing through the atomizing plates. A water tube is disposed above the atomizing plates and includes a plurality of nozzles for supplying water drops to the first tubes and second tubes of the atomizing plates for absorbing the oil particulates in the oily smoke passing through the oily smoke passage and carrying the oil particulates downwardly to a drainage hole.

Abstract: Along the path of the cooking fumes of an exhaust hood where the fumes move with swirling motion, forwardly adjustable blades are disposed between a retracted and an extended position to accentuate or decrease the intensity of the swirling path end of the centrifugal force applied to the particles to be removed, depending on the volume and the flow rate of the cooking fumes which ascend through the hood. This blade arrangement also ensures a constant static pressure inside the hood for a maximum efficiency of extraction.

Abstract: A grease collector housing is mounted directly atop a filter-containing kitchen exhaust hood at the exhaust collar. The housing includes a liquid reservoir at the bottom, a 360 degree shallow conical spray head immediately above the reservoir, an array of baffle-type grease filters above the spray, a filter-cleaning spray head above the array and a connector above it to the exhaust duct. A detergent water supply and removal system includes a pump and associated valving for moving a water-based solution through the spray heads and sprays as and when needed to remove grease from kitchen exhaust fumes and to wash down any residual grease from the filters and reservoir in the housing. A disposable cartridge-type water filter is included in the recirculating liquid system. Controls automatically provide the proper valve operating sequence for the operations as and when needed.

Abstract: An oily smoke treating and exhausting device for cooking equipment, has an upper smoke housing, two vertical passageways formed by three vertical plates extending down and up from the housing for oily smoke produced in cooking to be showered with water to let oil in the smoke be mixed with water and drop down into a separating tank so that oil may float on top of water in the tank and overflow into a waste oil tank to be exhausted.

Abstract: An exhaust cleaner includes a water trough installed in the exhaust piping of a filter hood through which exhaust gas from the filter hood passes, a water heater controlled to heat water in the water trough, a chemical detergent added in water in the water trough, a waste grease collector disposed outside the water trough to collect solid suspension particles from the water trough.

Abstract: An automatic cleaning device of a smoke exhauster comprises a fluid emitting pump provided with a pump body of hollow construction and with a revolving rod having an upper end fastened to a spindle of a motor of the smoke exhauster and further having a lower end fastened with a spiral body located in the interior of the pump body, which is provided at the top wall thereof with a plurality of fluid emitting tubes communicating with the interior of the pump body and at the bottom wall thereof with a plurality of fluid admitting tubes in communication with the interior of the pump body. A cleaning fluid reservoir of basinlike construction is detachably mounted under an air inlet of the smoke exhauster. The cleaning fluid in the reservoir is drawn into the pump body via the fluid admitting tubes and is then emitted via the fluid emitting tubes by the rotating action of the spiral body of the pump body.

Abstract: A cleaning system for exhaust ducts of cooking hoods. A hot water cleaning liquid is introduced at high pressure to a spray manifold in an exhaust duct. The manifold conforms to the internal perimeter of the exhaust duct and has nozzles for directing the cleaning fluid. The manifold is moved along the length of the duct to cover the internal surface area of the duct.

Abstract: A self-contained cleaning system for smoke exhausters comprising a bowl-shaped housing partially filled with cleaning fluid, and a sprayer tube rotatably secured in a central position within the housing having an upper portion and a lower portion. A plurality of upwardly aligned spout tubes are radially disposed on the upper portion of the sprayer tube, with the lower end of the sprayer tube having a beveled entrance and crescent-shaped apertures formed in proximity thereto. The housing can be mounted under a fan opening of the smole exhauster by engaging securing appendages therein with a wire grid grill covering the fan opening, and the upper end of the sprayer tube coupled to the hub of the fan by a coupling provided thereon.

Abstract: A hood adapted to remove contaminants from incoming airflow comprising a housing member having top, front, back and side walls, and defining a lower liquid sump, and an upper exhaust opening in the top wall, an inlet opening defined in the front wall of the housing member the front wall is inclined inwardly and downwardly, a partition extends between the side walls downwardly from the front wall and has a free end defining an air passage with the back wall leading to a large volume upper portion of the housing, a screen having openings therein extends between the side walls and downwardly from the free end of the partition into the sump, the partition has a dam on the free end thereof having a horizontal upper edge, liquid will overflow the dam on the partition and move across the openings in the screen to the sump, whereby air passing into the inlet opening passes through the liquid moving across the screen and then through the liquid moving across the screen and then through an agglomeration of liquid in th

Abstract: A grease extraction system includes an outer housing including a lower entrance passage and an upper exit duct for drawing the exhaust air stream upwardly through a scrubbing chamber, and a water supply manifold directs the water into the exhaust stream at the chamber area in such a way as to create a vortex of water droplets in the exhaust stream to encourage the extraction of grease, fumes and other contaminants from the stream.

Abstract: In a moveable self-contained exhaust unit for recirculating exhaust air from cooking apparatus comprising: a body having an air inlet and air outlet; a hood assembly connected to said body, said hood assembly adapted to receive cooking apparatus therebelow, and including an aperture communicating with said air inlet of said body; filter structure disposed interally of said body between said air inlet and said air outlet; a blower structure disposed interiorally of said body for drawing exhaust air from said cooking apparatus, through said aperture, air inlet, and filter structure, and recirculating said filtered air through said air outlet.

Abstract: A process for condensing vapor or mist material onto a thin first liquid film surface, which liquid film is generated and supported on the outer surface of a porous structure. A moving condensable vapor contacts the thin liquid film and is condensed onto the liquid surface. The condensed vapor drains by gravity action into a collection zone, together with a portion of the liquid film material being entrained therein. The vapor or mist material can be either substantially immiscible or miscible in the liquid film. The first liquid is preferably provided in a closed system and is recycled at near ambient temperature and at pressure conditions sufficient to produce the thin liquid film external to the porous structure, which has a porosity of 20-80%. An apparatus including the porous structure and liquid handling system for condensing an upflowing condensable vapor is disclosed.

Abstract: The present invention relates to a fume purification system used in conjunction with food cooking equipment. The fumes which are generated during cooking pass through a plurality of filter balls washed by an oxidizing liquid which removes the greasy contaminants from the said fumes. A cooling coil is also used in conjunction with the filter balls to accelerate the condensation of the fumes. If required, a charcoal filter is placed before the purified air is returned to the atmosphere or recirculated in the system.

Abstract: This invention is an apparatus which collects and stores grease discharged from exhaust fan systems of commercial kitchens. There is a means for collecting the grease which is adjustable so that it can be attached to fit most any size commercial exhaust fan. Once the grease is collected, it flows into a means for storing the grease. The means for storing the grease is releasably supported by means for collecting the grease. Thus, the means for storing the grease can be released, the stored grease removed, and then re-attached to the means for collecting the grease. The invention also includes a means for discharging rain water that is collected by the means for collecting grease. Any water which is collected is discharged into the drainage pipe located on the restaurant roof.

Abstract: An exhaust hood includes a collection chamber with a converging inlet passageway which directs the rising fume laden air downwardly toward a reverse turning area from which a baffled cleansing chamber extends upwardly. The collection chamber has a large top air capture pocket above the inlet passageway. The cleansing chamber includes alternating baffles on the opposite walls and generally a V-shaped in cross section with a smooth apex. The baffles define a generally serpentine for a mechanical cleansing path. The air cleansing nozzles permit periodic washing of the cleansing chamber surfaces. A common wall between the inlet passageway and cleansing chamber is pivotally mounted for access to the chamber. A water bath may form the bottom wall of the turning area. The stream angularly engages the bath with bath effective agitation, atomization and turbulence for mixing and removal of foreign matter from the air which then turns and moves through the cleansing chamber.

Abstract: A cooking or ventilating system has an extraction unit connected through an exhaust duct with the outside atmosphere, and a damper which is shiftable between positions operatively opening or closing the exhaust duct. A mechanism for opening and closing the damper under power includes an electric motor and a ball screw linear actuator driven by the motor. Air flow through the system is controlled to prevent exhausted grease from being carried up the exhaust duct. The damper is mounted for closing in the direction of air flow through the system and, when opened, for shielding the drive mechanism from smoke and grease, etc., in the air flow. Control circuits provide automatically timed normal operation of the motor as well as control operation of detergent and spray wash apparatus of the ventilating system. The control circuits also include a thermosatic sensor arrangement for sensing temperatures within the extraction unit.

Abstract: A continuous water wash hood type ventilation system for installation over one or more cookers, wherein exhaust air is drawn into and passed through one or more hoods for scrubbing by a spray of recirculated solution, including a water-detergent combination, with each hood incorporating a canopy formed of a front, back, side and top walls, an exhaust outlet provided through the top wall, an exhaust chamber formed within the canopy by means of a series of arranged baffles, generally comprising an upper, intermediate, and lower baffle, all staggered, to adequately pass the exhaust gases through the canopy to achieve scrubbing and discharge, and for properly channelling the collection of the scrubbing solution within a basin for draining to a supply and recirculation reservoir.

Abstract: For use particularly with exhaust systems from cooking areas, such as roof-mounted restaurant exhaust fans, a grease catch basin is mountable about the exhaust duct so as to collect condensed or precipitated grease from exhaust system parts lying above the catch basin, typically an exhaust fan and housing. Such condensed or precipitated grease flows or drips into the catch basin surrounding the duct. The catch basin is of sheet aluminum, and typically is mounted about the conventional roof curb through which the exhaust duct extends. A solvent reservoir is mounted in the upper part of the grease catch basin, and contains a solvent for breaking down grease. Solvent passes from the reservoir into the catch basin preferably via a rope wick extending through the bottom of the solvent reservoir into the catch basin. Wicking action can be controlled by controlling the compression of the rope wick. The catch basin is open-topped, such that rain water also can fall into the catch basin.

Abstract: A method of preventing smoke curling from beneath depending enclosure walls of a grease extraction ventilator, comprises providing a series of apertures in the walls from adjacent the lower edge thereof for a predetermined distance upwardly. The apertures are preferably comparatively small and relatively closely spaced, being preferably placed in parallel rows, also parallel to the lower edge of the wall, with the apertures of adjacent rows. The number of rows may be varied, depending on the height of the wall and the capacity of the ventilator, with additional apertures for a ventilator having a larger capacity. The apertures may be slots, such as relatively short, and with the spacing between parallel rows being equal to or less than the height of the slots, with the lowest row being relatively close to the lower edge of the wall. Or, the apertures may be circular or having other shapes, such as oval, elliptical or the like.

Abstract: A grease extractor incorporating a plurality of oblique baffles disposed within a barrel in angularly displaced relation with a longitudinal axis of the barrel. The oblique baffles intercross with each other at the longitudinal axis and are arranged in spaced and angularly displaced relation with each other so as to define within the confines of the barrel a plurality of congruent flow paths extending generally spirally about said longitudinal axis. When the grease-laden fumes are drawn into the grease extractor, they are forced to follow said flow paths as whirling about the longitudinal axis to move at ever-changing velocities, whereby the grease particles entrained in the fumes are subject to centrifugal action during the substantially entire course of flow to impinge continuously on the oblique baffles and the inner surface of the barrel to be deposited thereon.

Abstract: An air ventilation and cleaning system for cooking equipment having an exhaust hood disposed thereover in a building having a heating-ventilating and air-conditioning system for treating the air in the building. The exhaust hood includes a collection chamber and an exhaust chamber with an initial filter means mounted therebetween. An exhaust fan draws air loaded with cooking vapors, odors, fumes, smoke and other pollutants collected in the collection chamber through the filter means and the exhaust chamber, and out through an exhaust passage provided with a water-wash filter and a final filter, and then to the atmosphere. A source of fresh air provides a predetermined amount of fresh makeup air to the collection chamber.

Abstract: A hot gas cleaning and heat transfer method associated with a cooking hood assembly to separate foreign matter and liquids from gas moving through the hood assembly and transferring heat from the gas to a cooling liquid. A heat conducting wall surrounding a tubular passage accommodating a plurality of helical elements divide and direct gas into separate helical gas streams. The cooling liquid surrounds the wall to lower the temperature of the wall. Foreign matter, gas vapors, and liquids are separated from the hot gas into an annular sheath adjacent the heat conducting wall. The foreign matter, gas vapors, and liquid particles suspended in the gas are combined by mechanisms of centrifugal force, adhesion, condensation, and impaction. The gas vapors are condensed into liquid droplets. The liquid droplets, liquids, and foreign matter merge into a liquid film on the inside of the wall. This liquid film is moved down the wall and collected in an annular collecting member located adjacent the exit end of the wall.

Abstract: This invention relates to a roaster having smoke exhaust means to introduce smoke which is produced at a cooking plate for cooking material such as meat, fish and/or vegetables into a collecting exhaust duct having sucking means under a floor without making full indoors.

Abstract: A method of supplying tempered makeup air to a room in conjunction with a grease extraction ventilator disposed above cooking equipment in the room and having removal means for removing grease and smoke particles and the like from air mixed with products of cooking, which includes removing heated air and the remaining products of cooking, after passage through the removal means, through a discharge duct; tempering fresh air in a heat exchanger and discharging the tempered fresh air into the room; passing incoming air to the discharge duct in a manner which automatically regulates the amount of exhaust and makeup air required to remove and replace the minimal amount of outside air to eliminate heat, odors, smoke, gases, grease and dirt as the cooking load changes; and causing incoming air, which is not passed to the discharge duct, to become a portion of the tempered air for discharge into said room.

Abstract: A gas cleaning and heat transfer apparatus has a plurality of gas cleaning units that concurrently operate to separate foreign matter from the gas and reduces the temperature of the gas. Each cleaning unit has a heat conducting wall surrounding a tubular passage for carrying gas and foreign matter. A plurality of helical elements located in the passage are positioned in angular relationship relative to each other so that the gas moving through the passage is divided into separate helical gas streams. Heat from the gas in the passage is transferred through the wall to the fluid. The jacket around the cylindrical wall has a generally spiral rib in one embodiment which directs the flow of liquid in the chamber in a spiral path. The heating liquid is pumped to a location where the heat in the liquid is utilized. In another embodiment a spiral fin surrounds the heat conducting wall and a relatively airtight jacket surrounds the fin. Air cools the heat conducting wall as it circulates in the jacket.

Abstract: A gas cleaning and heat transfer apparatus associated with a cooking hood assembly to separate foreign matter from gas moving through the hood assembly and transferring heat from the gas to a liquid. The apparatus has a plurality of gas cleaning and heat transfer units. Each unit has a heat conducting wall surrounding a tubular passage accommodating a plurality of helical elements that divide and direct the gas into separate helical gas streams. A spiral ribbed jacket having a liquid accommodating a chamber surrounds the cylindrical wall and directs the flow of a liquid in the chamber in a spiral path. The foreign matter is separated from the gas as it moves in the spiral path through the passage by the combined mechanisms of centrifugal force, adhesion, condensation, and impaction. The liquid surrounding the wall lowers the temperature of the gas adjacent the inside of the wall causing condensation of vapors carried by the gas on the wall.

Abstract: In a preferred form a restaurant meat broiling range hood is integrated with a fiber bed-type mist eliminating apparatus. Assistance is provided in the preferred form by a pump to draw the gas stream through this apparatus. Electrical and plumbing control systems are shown provided as substantially pre-assembled units for ease of field installation. A unique cleaning system is provided, which is simple to conduct.

Abstract: A fume hood removes cooking odors such as grease from the air by providing positive contact with a recyclable water-detergent solution, thus serving to condense and emulsify the grease and thereby remove it. Positive contact with the water is caused by having a water-washed screen across the inlet of the hood, the screen having a mesh designed to cause a close interweaving of the air and water. The air then passes through the remainder of the hood and any remaining grease is removed by turbulent contact of air and water in the passage or along the inner sides of the hood. Through a series of one or more sloping dividers in the exhaust hood, the input recycled water may also create additional "waterfall" washing steps.The unit is maintained substantially at room temperature, even though receiving heated contaminated air, due to heat absorption by water evaporation in the washing process.

Abstract: An apparatus and a method for cleaning air carrying smoke, grease, ordors and other pollutants. The air having the grease and other pollutants, such as the exhaust air from a restaurant cooking grill, is passed through a filter box in which is mounted two pairs of planar filter members. The air is passed sequentially in halves through a lower pair of the filter members and then through an upper pair of the filter members and out of the filter box. The filter members are continuously scrubbed by a scrubbing solution comprising cold water and a cold water detergent. The water cools the air and grease in the air is congealed, and it acts as a filter, and it removes the congealed grease from the filter members.

Abstract: An air-cleaning, heat-exchange apparatus includes a main housing portion connected by means of an air inlet fan to the kitchen exhaust stack of a restaurant. The apparatus includes a plurality of heat exchangers through which a heat-absorptive fluid is circulated, simultaneously, by means of a suitable fluid pump. These heat exchangers absorb heat from the hot exhaust gas, out of the exhaust stack of the restaurant, which flows over and through these heat exchangers and transfers this heat to the circulating fluid which communicates with remote heat exchangers. These remote heat exchangers further transfer this heat to a stream of air, such as that from a cold-air return duct for supplementing the conventional heating system of the restaurant. Due to the fact that such hot exhaust gas is heavily grease laden, grease will be deposited on virtually all internal surfaces of the apparatus which this exhaust gas contacts.

Abstract: Choke attachments are applied to that portion of the inlet of the ventilator serving low pollution cooking units in a row of various types of cooking units in a restaurant kitchen. This reduces the rate of air removal from the kitchen, and in most cases also the rate of air removal from an adjoining dining room, to conserve energy without impairing the efficiency of the ventilator.

Abstract: An air-cleaning, heat-exchange apparatus includes a main housing portion connected by means of an air inlet fan to the kitchen exhaust stack of a restaurant. The apparatus includes an in-line series of three heat exchangers through which a heat-absorptive fluid is circulated, simultaneously, by means of a suitable fluid pump. These heat exchangers remove exhaust gas heat and further transfer this heat to a stream of air, such as that from a cold-air return duct. Due to the fact that the hot exhaust gas is heavily grease laden, grease will be deposited on virtually all internal surfaces of the apparatus which this exhaust gas contacts. The apparatus includes means for spraying exhaust gas contacted internal surfaces, as well as the hot exhaust gas itself, with a detergent solution in which the grease is soluble, thereby removing grease buildup from these internal surfaces.

Abstract: An exhaust system washing apparatus for use in an exhaust system having a flue and a suction fan to draw air through the flue in which a fluid conducting swivel joint is mounted at each end of the flue and together define an axis of rotation disposed centrally of the flue, a pair of substantially parallel conduits extended longitudinally of the flue and mounted on the swivel joints for revolution about the axis, and provided with orifices disposed toward the interior of the flue, one swivel joint being connected to a source of washing fluid under pressure and the opposite joint being adapted to receive a portion of the fluid from the conduits for delivery to a nozzle which emits such portion onto the blades of the fan.

Abstract: A filtered ventilating system for a cooking unit incorporates a hood emplaceable above a cooking unit. An exhaust stack extends from the hood for removing cooking fumes captured by the hood. A barrier wall divides the interior of the hood into inlet and outlet zones open to the cooking unit and exhaust stack, respectively, and is provided with a fume opening to receive a filter for grease and the like. Wash down pipes respectively extend along the exhaust zone of the hood adjacent the filter and along an exhaust stack. A motor rotates the wash down pipes and a suitable supply provides wash liquid to the pipes, which are thus energizable to simultaneously rotate and spray the wash liquid onto adjacent hood, filter and exhaust stack surfaces for cleaning same. Pivot and latch apparatus supports the filter for reversal on the barrier wall, to permit both sides of the filter to be cleaned by liquid from the wash down pipes.

Abstract: Disclosed is an air cleaning apparatus having a rectangular enclosure with air inlet and outlet passages and internal lower and upper baffles which sequentially direct inlet air through lower and upper water curtains which are provided by a recirculating water system. The apparatus also has a separate scrubbing water system to wash the internal surfaces of the apparatus. In operation, the scrubbing system is periodically activated and the reservoir of the recirculating water system is periodically drained and refilled with fresh water. Also disclosed is the method of using the apparatus.

Abstract: Exhaust system control apparatus operative to automatically close a damper in an exhaust duct leading from a spray booth when the spray booth is not in operation. A reversible damper motor is energized to rotate the damper to an open position when the spray booth is in operation. The damper motor is automatically reversed to close the damper in response to termination of spray booth operation. Energy is thus conserved by reducing the amount of heated air that would otherwise escape through the exhaust duct when the spray booth is not being used.In case of fire, the same damper is automatically rotated to a closed position in the exhaust duct by a spring loaded sprocket assembly on the damper shaft. This safety action takes place in response to the melting of a fusible link located in the exhaust duct and connected to a sprocket retention cable.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. The source of waste energy, including heat, is normally a grease extraction ventilator mounted to receive fumes and heated air from cooking equipment. Any other source of waste energy is normally suitable, such as heated air which has risen to the upper portion of a large room or enclosure, such as an auditorium, theater, meeting hall or the like. The heated air removed from such a position is adapted in part to be recirculated, but all of it may be used to furnish heat for heating fresh makeup air. Several forms of chiller, including specialized double compartment chillers, are disclosed.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. Supplemental heating, as by a furnace, or supplemental cooling, as by refrigeration, may be utilized when called for.Separate heat exchangers, as for separate areas, are alternatively supplied with heated transfer liquid or chilled water, or one or more supplied with heated transfer liquid and one or more others supplied with chilled water.The source of waste energy, including heat, is normally fumes and heated air from cooking equipment passed through a grease extraction ventilator.