Abstract: A multi-unit grease filter includes a first filter unit and a second filter unit, each having an upstream series of spaced apart elongated baffles and a downstream series of spaced apart elongated baffles offset from the upstream series of baffles so that the baffles overlap and expose the air to multiple surfaces as it travels through the filter. The baffles have their ends connected to a pair of end frame members, each of which has at least one spacer in the form of a side edge having a first portion co-extensive with the upstream series of baffles and a second portion co-extensive with the downstream series of baffles so as to provide an off-set in each of the end frame members so that when the first and second filter units are disposed in abutment side by side, the off-sets align and overlap so that a bifurcated seam line is formed at the abutment and a downstream baffle overlaps with an upstream baffle at the seam line.

Abstract: A fume extractor comprises a housing and a predetermined number of suction devices. The housing has a bottom board provided with fume sucking ports. Each of the suction devices comprises a motor provided with a rotating shaft upon which a wind impeller is mounted in such a manner that the wind impeller is corresponding in location to the fume sucking ports of the housing. Each of the suction devices is further provided with a filtration member having a top segment and a bottom segment which are fastened respectively to a top board and a bottom board of the housing. The filtration member has an inner wall that is located at a distance from the wind impeller. The housing is further provided with a plurality of exhausting holes.

Abstract: Odor/pollutants from cooking food products are collected and delivered to a plenum proximate the burner of a heat exchanger which serves the food cooker. The burner issues a flame into a combustion chamber having a baffle arranged normal to the flame and a central opening in the baffle is partially occluded by a frusto-conically shaped turbulence increasing body spaced from the baffle to define an annular flow slot along the body which is has an central flow passageway therethrough. Efficient pollution vapor incineration results.

Abstract: A grease filter and collection assembly for roof ventilators and the like includes a frame structure having a generally central aperture through which a grease discharge vent projects when the frame structure and trap assembly are installed surrounding the vent, and a replaceable grease-trapping material is removably secured in the frame structure so that the grease-trapping material is exposed within the aperture for trapping grease discharged from the vent. In a preferred embodiment, the frame structure is assembled from extruded frame members which integrally include a plurality of channels for securing and mounting the assembly for retaining the grease-trapping material within the frame structure. Upper and lower channels accommodate corner connections of the frame members. The frame members have side walls which peripherally enclose the grease-trapping material which is tucked between the upper and lower channel inwardly extending from the side wall.

Abstract: An air filter is provided for a food cooking apparatus to avoid the necessity for venting same within a building and permitting the use of a free standing independently movable structure capable of receiving a movable cooking apparatus or accommodating a fixed cooking apparatus such as a grill.An air filter assembly for filtering exhaust air from cooking devices is illustrated as having filter elements in vertically aligned stacked relation accessibly positioned in an imperforate housing.

Abstract: A trimmable range hood filter for covering both an inlet opening of a range hood and a light on the range hood adjacent the inlet opening. The filter includes a rectangular filter element, four non-telescoping frame members sequentially arranged to form a rectangle, attachment clips joining the frame members at the corners, a translucent plastic pane, and a separator bar with an "S"-shaped cross-section joining an edge of the pane to an edge of the filter element. The pane and filter element, joined by the separator bar, fit within inwardly facing channels of the frame members. The various parts of the range hood filter, i.e., the filter element, the pane, the separator bar, and the frame members, are trimmable by scissors to fit the range hood dimensions, with the filter element covering the inlet opening and the pane covering the mouth of a cavity in which the range hood light sits.

Abstract: The present invention is an exhaust smoke purifier apparatus which contains a reservoir part consisting of an adsorbent and a purifier part. The purifier part includes a purifying agent. The present invention has a regeneration function and oil smoke and the like generated in cooking is drafted into the purifier apparatus by a greater air blow rate to temporarily hold it in the reservoir part. After cooking, the oil smoke and the like is introduced from the reservoir part into the purifier part at a smaller air blow rate and is thereby purified. The exhaust smoke purifier apparatus requires minimal manual treatment for captured oil smoke and the like, and is very clean. The apparatus can effectively purify with a very small amount of purifying agent. The apparatus can also be made small.

Abstract: A scrubber for removing contaminants from an airstream, preferably including an intake duct, a scrubbing chamber, a stilling chamber, and a filtration unit. The scrubbing chamber has a primary sump and an overhanging secondary sump. A weir gate assembly is employed with the secondary sump to form a water induction slot causing water from the secondary sump to be drawn into the airstream. A baffle arrangement causes the water entrained airstream to flow over the secondary sump and a cascade plate creates a water curtain above the secondary sump. A perforated agitation panel is also disposed over the secondary sump to break up the water droplets in the airstream into smaller droplets.

Abstract: A method of attaching a sheet filter to an inlet opening by covering the inlet opening with a wide sheet filter and fixing the periphery of said sheet filter to the periphery of said inlet opening by use of magnet holders or other fixing means so as to enable a replacement of only the filter which has become dirty by the use.

Abstract: It has been found that an air filter may be provided for a food cooking apparatus to avoid the necessity for venting same within a building and permitting the use of a free standing independently movable structure capable of receiving a movable cooking apparatus or accommodating a fixed cooking apparatus such as a grill.

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: A vertical type smokeless exhauster which comprises a vertical body with a guide plate holder on the top and a guide plate to trigger a micro switch by sliding a guide plate to its outermost position in order to start fan motors which suck oily smoke into a ventilation opening in the body. The oily smoke is then filtered by an oil filter element in a filter tank before it is discharged to the atmosphere. Oily contents at the fan motor and filter tank are collected by oil collectors and an oil pan, respectively.

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 device for removing (i.e., suction, capture and trapping) vapors and products carried by the vapors, for placement above a system for cooking food products in water or oil, circulates the exhaust gases in a cyclone having cooled walls to cause cold-wall condensation of the exhaust gases over the flow path through the cyclone.

Abstract: A filter pad for range hoods is disclosed which comprises a plurality of sheets formed of wood paper pulp fiber material. Each sheet is slit and expanded to form a plurality of adjacent multi-sided openings. The outermost sheet on the upstream side of the pad is provided with a plurality of parallel sets of three printed lines formed by oil soluble dye components. The lines flanking each central line in each set are of selected different colors. Each line adjacent to the central line in each set is spaced at a selected distance from the central line to permit the different color dye components to bleed together upon a given loading level of the pad with oil and fat aerosols to form a band having a third different color to visually indicate that the filter pad is in need of replacement.

Abstract: A disposable range hood filter and flame arrester having front and rear surfaces spaced closely apart from each other and connected to each other by flanges extending beteween them. Both front and rear surfaces comprise a plurality of spaced apart panels extending between the sides with each panel having a center offset panel portion lying inwardly of the body in relation to the remainder of the panel, so as to afford a depressed center section. A lower portion of each panel includes an aperture for permitting grease collection on the depressed center panel portion to drain into a bottom part of the filter body. The front and rear panels are laterally offset from each other so as to provide a labyrinthne path for air passing from the front to the rear of the filter unit. Preferably the units are made from a thin metal and are one inch or less in thickness.

Abstract: A disposable article, suitable for absorbing and immobilizing grease generated during cooking, has a housing containing an absorbent bed of particles and polyolefin microfibers.

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: Apparatus for cooking food in a convention oven having a conveyor includes a ventless exhaust system in which a fan pulls heated air through a filter system including an aluminum filter, an electrostatic precipitator and a charcoal filter. Cleaned air may be recirculated within the building space in which the oven is located.

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: A commercial air ventilation system with an improved air distribution and mixing characteristics for use in a commercial kitchen is disclosed herein. The air ventilation system is characterized by a commercial stove top hood which is divided into make-up air and exhaust air sections. The make-up air section is divided into primary make-up air plenum and a secondary make-up air plenum. The secondary make-up air plenum allows air flow into a pre-exhaust chamber through a continuously perforated plate without the need for a screen. Air flows from the pre-exhaust chamber to an exhaust cavity, across a grease filter and out through an exhaust plenum and exhaust conduit in such a manner that the contaminated air is expelled from the kitchen. The make-up air which rushes in to replace this air does so in a moderate and controlled manner so as to avoid the temperature extremes and drafts which otherwise are often prevalent in the kitchens of commercial establishments such as restaurants and hotels.

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: Apparatus for cooking food includes a ventless exhaust system whereby a fan pulls heated air through a filter system which includes an aluminum grease filter, an electrostatic precipitator, a flame arrester and a charcoal filter. A fire extinguisher is also included. Cleaned air may be recirculated within the building. The apparatus may be operated either as an open-faced, unpressurized fryer or as a pressurized or semi-pressurized fryer.

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: An improved automatic french frying machine and method uses a supply of cooking oil which remains in a cooking vat during normal operation and is heated directly in the cooking vat. A system of thermostats combines with a heating element within the cooking vat to ensure proper cooking temperature and safe operation. An automatic initialization and monitoring system ensures safe startup and operation. Preferred embodiments also include an automatic flushing cycle which is activated at predetermined intervals to clean the cooking vat and replenish the cooking oil within the vat. A specially shaped cooking vat ensures that food particles will be removed from the vat during the flushing cycle. Oil degradation is minimized by either an open-topped cooking vat or a cooking vat having a lid which remains open during cooking.

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: A removable, washable air filter apparatus is formed with two V-shaped rectangular mesh filters held in place side by side within a housing with the vertices of the V filters draining grease and moisture into a removable pan. A mounting bracket maintains the pan in position to receive extracted grease and moisture without impeding air flow through the exposed filter mesh. The top edges of the housing have outwardly formed flanges for removably mounting the housing by means of overlying swivel retainers provided around the periphery of mating flanges on an intake opening of a ventilation hood or air duct.

Abstract: An exhaust-only type of kitchen exhaust hood is provided with removable fume-guide plate upstream of the in-hood grease filters. The plates are shaped to provide a forward flow of fumes from the rear of the hood forward over the cooking unit toward the front lip of the hood. A slot is provided between the front edge of the plate and the front wall of the hood whereby the air flow into the hood accelerates around the front edge of the plates to provide a flow rate of approximately 200 feet per minute at the front edge of the hood. Slots are provided between the hood ends and adjacent side edges of plates next to the ends. The plates are movable to facilitate changing of filters.

Abstract: In a ventilating hood generally for use in conjunction with a heating apparatus, such as a cooker, a housing incorporates both a diverter and a rear support, the two of which join to segregate the incoming air through a supply conduit from the outgoing air traversing through a support arranged filter and into an exhaust outlet. The front wall of the housing, which is spaced from the lower end of the diverter, incorporates a slightly upwardly inclined deflector, which directs substantially all of the air incoming to the hood upwardly and rearwardly directly towards for movement through the filter, and out of the exhaust outlet, and since the air is generally unencumbered by any structure in the path of its flow, it moves in a rather parallel course with the arranged diverter, and rapidly exits carrying the entrained fumes therewith significantly reducing the BTU requirements for operation of this hood.

Abstract: A reusable grease filter for installation in an exhaust system for restaurant cooking equipment and the like comprising a frame adapted to be fixedly mounted in an exhaust system opening; louvers positionable within the frame having a plurality of discontinuous overlapping louver surfaces extending generally transversely of an exhaust system airflow direction and providing a plurality of tortuous air passages, whereby passage of flame through the grease filter is substantially blocked by the transversely extending overlapping louver surfaces, and whereby grease and other airborne particles are removed from exhaust air; and brackets fixedly mounted on the frame for stably holding the louvers in a predetermined position and for enabling rapid removal and reinstallation of the louvers in the frame for facilitating cleaning of the louvers. Specific structure of the frame, louvers and brackets which enables these functions is described.

Abstract: A system for removing fumes from the space above a cooking surface includes a hood, having front and side wall panels located above said cooking surface and covering the space above said cooking surface. The front wall panel is located forwardly of said cooking surface to form an entrainment chamber between said hood and said cooking surface. The entrainment chamber is in communication with air intake means and an exhaust means. The air intake means comprises an intake blower for introduction of air from the outside into a pressurized plenum located above said cooking surface. The pressurized plenum includes an air distribution baffle and an air velocity valve assembly, which opens into said entrainment chamber. The rear surface of said front panel supports an air foil, located below the air velocity valve assembly. The air foil extends across said hood, and projects at an acute angle toward the cooking surface.

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 filter (2) for a ductless range hood includes a layer (8) providing an impact barrier for removing coarse particles such as grease spatters from cooking discharges and resisting the heat of incoming discharges, for preserving filtering capacity and service life of downstream layers, a second layer (10) providing absorption of grease remaining in the cooking discharge after passage through the first layer, a third layer (12) for removing noxious gases such as oxides of nitrogen and carbon monoxide from the cooking discharges and for absorbing odors, and a fourth layer (14) for removing fine particles such as smoke from the cooking discharges. Various combinations of layers are disclosed as well as various structural and framing configurations.

Abstract: A hood is provided for use over pizza ovens in pizza preparation and delivery vehicles. The hood comprises two intake air fans and one inline exhaust fan. The intake air fans are each disposed adjacent a side wall of the vehicle and direct air from the sides toward the center of the hood. The exhaust fan is disposed adjacent a back wall of the vehicle between the two intake air fans. The exhaust fan exhausts the air from which the vehicle. A back draft damper is disposed downstream the exhaust fan. Hinged louvers on the back draft damper can be adjusted with a threaded rod to balance the air flow within the system. Vents adjacent the intake air fans have fixed louvers shaped to impede water droplet flow from entering the vehicle.

Abstract: A backshelf compensating exhaust hood includes an upper wall passageway for forming and redirecting an induction air stream into and through an exhaust chamber to an exhaust passageway, the upper wall passageway extends through the upper wall to a smooth curved reverse passageway redirects the air into a short slot which discharges a stream into the upper end of the exhaust chamber. A forward tilted filter is located in the exhaust chamber to form the back wall of the exhaust chamber and with the lower end spaced inwardly of the upper end and with the upper portion aligned with the induction air stream. The filter is oriented to define an essentially right angle with the interior upper wall of the exhaust chamber. The top wall of the exhaust chamber extends inwardly and upwardly slightly to the filter. The induction air supply passageway is a relatively large passageway which has a depth which is a multiple of the depth of the slot.

Abstract: Semiautomatic food frying apparatus is disclosed which provides apparatus which may be easily and safely operated to prepare small portions of various food products. In one embodiment, the food frying apparatus includes an upright cabinet with a fan assembly mounted to exhaust air through the top of the cabinet while drawing air in, through and from the lower portion of the cabinet. A removable one-piece filter unit is positioned in the path of air flow to remove odors, gases, smoke, etc. . . . from the air before the air is exhausted back into the room. The removable filter includes a paper filter together with activated charcoal particles configured as an integral unit. In another embodiment, the fan assembly and filter unit are replaced by a closed-loop air cleaning system which does not discharge the internal air of the apparatus into the room. A container for holding a supply of cooking oil is located in the lower portion of the cabinet.

Abstract: Food frying apparatus is disclosed which provides apparatus which may be easily and safely operated to prepare small portions of various food products. The food frying apparatus includes an upright cabinet with a fan assembly mounted in the upper-most portion of the cabinet to exhaust air through the top of the cabinet while drawing air in, through and from the lower portion of the cabinet. A removable one-piece filter unit is positioned in the path of air flow to remove odors, gases, smoke, etc. from the air before the air is exhausted back into the room. The removable filter includes a paper filter together with activated charcoal particles configured as an integral unit. A container for holding a supply of cooking oil is located in the lower portion of the cabinet and is positioned in an insulative shroud with a resulting decrease in BTU's required to operate the apparatus. The heater element is embedded in the bottom portion of the container and does not directly contact the cooking oil.

Abstract: A double-fan apparatus for use in combination with an exhaust hood adapted to be mounted over a cooking appliance in a kitchen. The fan has an upper impeller section and a lower impeller section each of which is a centrifugal impeller. There is a conduit to pass grease-laden fumes upwardly from the exhaust hood to the lower impeller section, and a conduit to conduct makeup air downwardly from the double fan to the hood. The double fan includes relationships by which the makeup air passes generally horizontally from the ambient atmosphere to the upper impeller section, then flows generally horizontally from the upper impeller section to the peripheral regions of the double fan, and then flows downwardly to the conduit connected to the hood. A grease trap is built into the double fan to prevent upward flow of substantial amounts of grease.

Abstract: Automatic food frying and dispensing apparatus is disclosed which is housed in a supporting cabinet and includes a device for holding a supply of cooking oil and a heating device for maintaining the temperature of the cooking oil at a predetermined temperature. A fan assembly exhausts air through the top of the cabinet. A derated precipitator, a flame arrester and a charcoal filter are positioned upstream of the fan assembly and in the path of air flow. A switch device is positioned in the path of air flow and shuts off the heating device if the air flow drops below a predetermined value. Food handling apparatus automatically lowers the food to be cooked into the cooking oil when a customer selects a desired cooking time and automatically raises the food from the cooking oil and dumps the food into a container positioned at the food collection station at the end of the preselected cooking time.

Abstract: A kitchen exhaust apparatus comprises a fan housing which includes a cylindrical portion and an extension which extends tangentially and contiguously from the cylindrical portion. A bottom wall extends across the cylindrical portion and the extension, which bottom wall defines an inlet port in the cylindrical portion. A portion of the bottom wall located in the extension is sloped upwardly in a direction away from the cylindrical portion. An outlet port is located above such sloped portion of the bottom wall. A motor driven centrifugal fan is arranged in the cylindrical portion above the inlet port to draw-in air and cause particles entrained in the air to travel into the extension and upwardly and downwardly along the sloped portion. Drain apertures are located in the bottom wall so as to lie along the path of travel of such particles to facilitate drainage thereof into a gathering tray mounted beneath the fan housing.

Abstract: A self-contained induction air supply unit is provided for an exhaust hood having an exhaust fan drawing of freeze laden air through an angled filter. The supply unit includes a supply chamber with a bottom stream forming slot having a curved bottom wall for turning air through the slot and into the exhaust hood. An air deflector includes an adjustable support coupled to the curved bottom wall to vary the angular orientation of the stream to permit changing the angle of the induction air stream for proper engagement with the filter and simultaneously change the curved bottom wall. The deflector in one form includes a single plate having a curved portion abutting the underside of the curved bottom wall and an outer planar portion. In another structure the curved bottom slot wall is flexibly mounted. A deflector plate is pivotally mounted beneath the outer end of flexibly mounted wall and projects outwardly thereof.

Abstract: Food frying and dispensing apparatus is disclosed which is housed in a supporting cabinet and includes a device for holding a supply of cooking oil and a heating device for maintaining the temperature of the cooking oil sufficiently high for cooking successive batches of food products introduced into the oil by a food support basket. A fan assembly exhausts air through the top of the cabinet. A derated precipitator, a charcoal filter, a fragrance holding apparatus and an ozone generator are positioned upstream of the fan assembly and in the path of air flow to eliminate any smoke or odor produced within the apparatus prior to discharge of the air from the cabinet. Food handling apparatus pivotally positions the food support basket in three separate and distinct positions with the three positions being in the cooking oil in a "cook" position, out of the oil in a food product "dispense" position and out of the oil in a "ready" position.

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: An air ventilation 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 a 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 and the exhaust chamber and out through an exhaust passage to the atmosphere. A source of fresh air provides a predetermined amount of fresh makeup air to the collection chamber. A temperature control unit is connected to another source of fresh air, and to the return air duct of the heating-ventilating and air-conditioning system of the building or a room in the building, for providing a combination of fresh air and tempered air to an air curtain passage for forming an air curtain along the front side of the exhaust hood.

Abstract: An energy-saving ventilating system for a restaurant kitchen stove provides a first air stream flowing upwardly from a location adjacent the rear edge of the cooking surface, a second air stream discharged into the space in front of the stove where the cook stands and flowing rearwardly above the cooking surface, and a third air stream discharged downwardly from an outlet above the front portion of the cooking surface so as to squeeze the second air stream as the latter flows over the front edge of the cooking surface, causing the second air stream to flow faster in that area, the third air stream acting as an invisible baffle to reduce induction of conditioned air from the kitchen into the space above the cooking surface.

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: A fume exhauster device comprising first means for generating a first air current directed substantially axially toward the first means, and second means for generating a second air current concentrically surrounding the first air current and flowing in circumferential and axial directions away from the second means, the second means comprising a substantially annular exit opening defined at least along its outer periphery by a peripheral surface extending in axial direction for forming the second air current into a cylinder shroud the outer diameter of which is substantially equal to the outer diameter of the exit opening.

Abstract: A vent apparatus for a surface cooking appliance comprises a vertically slidable closure mounted to slide in a duct in the surface of the appliance. The closure has a slide engaging a track in the front of the duct below the surface of the appliance, an open side within which filters may be removably mounted.

Abstract: In a device for releasing an odor-destroying substance into an air stream, such as for use with a kitchen exhaust hood, a refillable reservoir has an open side covered by a hood-shaped wall with flow openings through the wall. A cover disk extends over the hood-shaped wall on the opposite side from the reservoir for adjusting the flow openings, the hood-shaped wall affords a forced guidance of at least a part of the air stream past the open side of the reservoir.