Abstract: A filter module is disclosed wherein the module has a three sided channel shaped water permeable frame member and a filter mat member which inserts into the frame to form a filter module which may serve as a filter element of a filter for materials discharged from cooking hood vents. The filter modules are interlocking and permit the in place fitting and assembly of the modules into filter assemblies around and/or under a cooking hood exhaust vent. The overlapping and interlocking elements of the modules provide a secure and readily serviced filter module assembly.

Abstract: The present invention provides a method, apparatus and system for safely and efficiently controlling a ventilation hood having at least one blower unit disposed within a hood. The blower unit operates at a first speed which is substantially below a threshold speed when a speed controller is in a first setting and a sensor does not detect a trigger condition. The blower unit also operates at or above the threshold speed when the speed controller is in a first setting and the sensor detects the trigger condition. In addition, the blower unit operates at or above the threshold speed when the speed controller is in a second setting, and deactivates when the speed controller is in a third setting.

Abstract: A containment assembly for collecting grease or other effluent that includes a layered composite of effluent filtering and trapping materials in the form of a separation filter, a center filter and a barrier layer disposed in a layered manner. The separation filter and center filter desirably include a polypropylene material and each have a different porosity. The separation filter, center filter and barrier layer may be disposed between a top and bottom spacer layer in a layered manner. The composite may be received within a frame assembly. The effluent containment assembly also may include flashing for deflecting the effluent away from the equipment or other effluent source, an assembly for securing the frame assembly to equipment or other source of effluent at an elevation relative to a roof or other surface to be protected, a pole assembly for holding the composite within the frame assembly, and a windbar assembly for holding the composite together during wind conditions.

Abstract: Shots of grease biodegrading bacteria consortia are mixed with a flow of air which ascends through an exhaust hood. Preferably, the exhaust hood includes a filter device which comprises a narrowing passageway which is located immediately below a baffle filter thereby regularly distributing the air flow through the entire area of the baffle filter. The hood is constructed to cause a swirling motion to the air flow.

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: An exhaust hood is disclosed which comprises an open underside and a grease filter defining an exhaust plenum between the hood and the grease filter and a flow path through the grease filter. A shutter-like panel is slidable into the flow path adjacent to the grease filter for blocking a portion of the flow path to adjust the distribution of air across the face of the hood without altering the volume of air flowing through the exhaust hood. Multiple side-by-side panels may be provided and each panel preferably tapers in height across its width. An intake fan is provided at a front portion of the hood to direct room air from adjacent the hood through an intake plenum and downwardly at a front portion of the space beneath the hood to create a partial air curtain which is then exhausted through the hood.

Abstract: A ventilator hood including an air blower suitable to draw fumes emanating from a fume producing apparatus through a contaminate filter, a charcoal filter, and a HEPA filter including filter condition indicating means, fire suppression means, and special adapter plate means for directly connecting the ventilator hood to the fume producing apparatus.

Abstract: Disclosed is a contaminated waste steam heat recovery apparatus 10 and method therefore which includes a primary condensing unit 38, a low pressure water washing unit 26, a liquid to liquid heat exchanger 36 and a vent fan 31. Waste gas is ducted from fryer 11 to a de-super-heating chamber 14 wherein superheated steam is converted to saturated steam by spraying water into the steam using spray nozzles 15. The gas is then introduced into a vertically disposed air to liquid heat exchanger 16 and is drafted downward therethrough. As heat is removed from the waste gas, water vapor in the steam condenses and in the process, collects some of the oil and hydrocarbons present. A plurality of condensate trays 19 are disposed below the bottom end of heat exchanger 16 in a cascading fashion to collect hold the condensate in the airflow path such that it will absorb some of the heat still present in the remaining waste gas.

Abstract: A rooftop grease containment system for absorbing the high viscosity grease carried by the gaseous effluent generated by cooking food and released through a rooftop exhaust vent, comprising 4-8 mm hydrophobic silica particles contained within porous pads, tubes and pillows placed in different positions in proximity to the rooftop exhaust vent is disclosed.

Abstract: The invention concerns a cooking appliance comprising an external housing (3) in which are incorporated a vessel (12), device (14) for electrically heating the vessel, and a box (23) housing a removable device (25) for condensing vapors urged to be connected on operating device (27) communicating with the vessel. The appliance comprises sensing device (65) for sensing the presence of the condensing device (25) in the box (23) and actuated by the condensing device (25) when it is present in the box (23), and a switch (68) whose control capable of closing the power circuit supplying the heating device is dependent on the actuating of the sensing device (65).

Abstract: An exhaust unit for filtering air from an exhaust hood above cooking equipment comprising modular components including an exhaust hood, filtering means and blower means operating as a single unit regardless of configuration.

Abstract: A separation process comprises passing a gas or vapor stream contaminated with an undesired substance or contaminant downwardly through a plurality of spiral separating media such that the direction of movement of the gas or vapor stream is transversely the longitudinal axes of at least some of the spiral separating media. The undesired substance or contaminant is allowed to separate from the gas or vapor as it passes through the bed, and purified gas or vapor is withdrawn from the bed.

Abstract: A separation process comprises passing a gas or vapor stream contaminated with an undesired substance or contaminant downwardly through a bed of curled separating media. The undesired substance or contaminant is allowed to separate from the gas or vapor as it passes through the bed. Purified gas or vapor is withdrawn from the bed.

Abstract: An exhaust device (100) for a kitchen exhaust system incorporating a range hood (11) is disclosed, which is capable of substantially reducing generation of noise while efficiently evacuating fumes from the kitchen without a suction loss. The exhaust device (100) comprises a vent box (20) communicating with an exhaust duct (40), which may be housed in the hood (11) or in a housing box (10) provided above the hood (11). The vent box (20) includes a connection enclosure (20a) in its upper portion, which converges toward the duct (40). The vent box (20) contains a pair of partitions (21) each having a tilted plate (22), which provide a pair of vent routes (23). Between the partitions (21) is provided a drive motor (31) and in each vent route (23) is provided a sirocco fan (33) driven by the motor (31) whose blades (33a) are converged toward the motor (31).

Abstract: A process and device for removing and oxidizing organic substances from an extracted air stream. The air stream is flowed through a filter which adsorbs the organic material, where the airstream is bypassed around a catalyst until the filter is saturated. At saturation a heater supplies heat to the filter to desorb the organic material. The catalyst is heated by another heater at the desorption period and receives the organic material and extracted air stream to oxidize the organic substances.

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

Abstract: A grease filter system for use in connection with retaining viscous products of combustion in commercial food preparation environments includes a receptacle and a filter element removably supported within the receptacle. The receptacle has a lid covering one end thereof and a bottom. The lid includes an opening through which grease, condensed steam, water and other products of combustion enter the system. The receptacle further includes a plurality of apertures disposed spaced from the bottom about the perimeter of the receptacle such that the filter system retains grease and other viscous fluids while allowing condensed steam, water and other products of combustion to pass through the filter element and the receptacle out through the apertures.

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: An oil collector for an upright smoke exhauster is provided, the oil collector includes an oil filter of predetermined mesh and attached at a lower circumference with a guide device which is prepared to introduce the oil from the filter into an oil cup at a lower portion of the exhauster. The filter is engaged into a circular vent in the housing of the smoke exhauster together with the guide device which has a tongue of an inverse isosceles triangle projected downward from an under side of a sloped portion thereof for facilitating the oil to be concentrated on the lower point of the triangle and dripped directly into the oil cup. The improvement has been characterized in the simple structure and greater efficiency in removal of the oil from the smoke exhauster.

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: An exhaust hood ventilating system which uses an intake blower of outside air, and an exhaust blower with means for regulating the speed of the blowers and regulating the volume of air into the ventilating hood and means for diverting outdoor intake air into the kitchen area for ventilation before it is passed back to the hood for exhaust to the outdoors.

Abstract: An existing exhaust hood having a single coarse particulate filter for filtering contamination laden air is replaced by a filtration module preferably having two filters and optionally a third filter. The two preferred filters are a grease baffle filter and an electrostatic air cleaner (EAC). Optionally, a charcoal filter would be a third filter in a series of three filters for removing odors from exhausted air. The preexisting exhaust fan of the hood would be maintained in use and the preexisting duct work to the exterior of a building would also be maintained for exhausting the now filtered air to the exterior of the building. The filtration module would lower the amount of volatile organic compounds to an acceptable level so as to prevent pollution of the exterior environment of a building.

Abstract: In a catalytic assembly having an oxidation catalytic unit disposed above the broiling area of a fat-food broiler for enabling the catalytic oxidation of volatile broiling smoke organic contaminants, a low pressure drop open-pore metallic flame-arresting filter screen disposed between the broiling area and the catalytic unit and substantially completely overlying the broiling area and containing upon the screen an adherent coating comprising a high surface area inorganic oxide adsorbent and an inorganic binder therefor, the coating serving to adhere salt, phosphorous and other catalyst-poisoning compounds in the broiling emissions. Preferred methods of coating and broiler flame-arresting use are described.

Abstract: An apparatus (1) for use in heat treatment of for example French fried potatoes (10). This process takes place in a treatment chamber (3) where the product is exposed to intensive heat radiation from a number of quartz tubes (14) while they constantly are turned by means of a rotating driving wheel (15) with a number of carriers (16) placed along the periphery. Humidity, smoke and smell separated from the product during this process are sucked off by means of a ventilator (17) which leads the polluted air through a filter device (4) via a convector (5) between the treatment chamber (3) and the filter device (4). The whole arrangement is built up into a cabinet (2) which on the top and at the bottom is provided with ventilation openings (26, 27) through which secondary air is flowing for cooling the polluted air flowing through the convector (5). Thereby a heat exchange effect is obtained for reducing the sucked off temperature to an acceptable level before the air reaches the filter device (4).

Abstract: A combined self-cleaning grease and particulate filter and heat exchanger used to collect thermal energy normally vented through flue hoods or other ventilation systems in commercial or institutional kitchens. Fluids circulated within the heat exchanger/filter may then be utilized for heating other mediums, such as water or air, and to promote drainage of the particulate matter and grease from the filter into a removable storage container. The heat exchanger/filter is provided with means for quick assembly and designed to replace existing grease filters, thus allowing economical retrofitting. A baffle filter is further provided which utilizes particular flow patterns to promote a more efficient transfer of grease and particulate matter from the airborne fumes to the filter.

Abstract: A grease filter capable of separating the oil particles at an increased efficiency only with the use of a fan of small capacity. The grease filter includes a frame supporting a plurality of baffles spaced in a row. Each baffle has a generally V-shaped cross-section with first and second walls which merge into a bent. The grease filter is arranged to have the bents opposed to each other and to locate the first and second walls, respectively on upstream and downstream sides of the filter, thereby forming upstream passages between the first walls of the adjacent baffles and forming downstream passages between the second walls of the adjacent baffles. The baffles are configured such that the upstream passage has a width which is narrower towards a downstream end of the upstream passage than at an upstream end of the upstream passage, and that the downstream passage has a width which is greater than the width of the upstream passage at the downstream end thereof.

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: The suction hood has an air depollution apparatus that is associated therewith and includes, inside a container that is connected to an intake grille in a downward region and to a discharge grille in an upward region, a mechanical filter, an activated-charcoal filter, suction fans that are adapted to produce a flow of air, and a collection device. The collection device includes, in succession: an electrification grid, which is supplied at a high voltage with negative polarity and is arranged on a horizontal plane that lies transversely to the container; a partition, which is arranged at an angle in front of the electrification grid so as to convey the stream of air toward at least one region that has a narrower cross-section; a negatively-charged deflector plate and a positively-charged collector plate that are arranged vertically so as to face each other at a short distance, so as to delimit the respective above- mentioned region having a narrower cross-section.

Abstract: A downdraft cooktop includes an electrical switch having a plurality of cooking rate selections, a vapor withdrawal opening formed in the cooktop adjacent a grill element, a vapor withdrawal duct below and in communication with the withdrawal opening and with a withdrawal fan, an electric motor for driving the withdrawal fan, and a fan control switch for varying rates of operation of the fan. The withdrawal fan is operable for downdraft withdrawal of cooking vapors resulting from operation of the grill element. Grill operation is sensed and during grill operation, the fan control switch is bypassed and the electrical fan motor is operated at a high rate for vapor withdrawal.

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: A cooking apparatus including an open housing (1) closed by a lid (8), a cooking vat (4) provided inside the housing, and a cooking vapor condenser device (13) provided outside the housing. At least one vapor outlet (22) is provided between the upper portion of the vat (4) and the condenser device (13) and includes an upstream section (24) integral with the lid (8) and having one end (25) in communication with the upper portion of the vat (4), and a downstream section (27) connecting the other end (26) of the upstream section with the condenser device (13). This system is suitable for household deep fryers.

Abstract: An exhaust hood for commercial or institutional kitchens. The hood is designed to capture individually each of the plumes emanating from diverse cooking or heating devices disposed beneath the hood and includes means for minimizing the quantity of air removed from the atmosphere ambient to, but outside the hood, this means including a plenum within the hood and individually sized entrance openings into compartments defined above each of the cooking or heating devices and through which ambient air is drawn at a minimum capture velocity for that plume anticipated to be generated by the heating or cooking device that is associated with each compartment. A method for carrying out the invention is disclosed.

Abstract: A grease filter assembly is provided for absorbing grease discharged from a spout of a grease discharge vent extending from a roof. A support frame is mountable to the duct of the grease discharge vent and a grease absorbing pad is supportable upon the support frame in stationary position below the spout and in spaced relation from the roof. The support frame includes support rods mounted adjacent respective sides of the discharge vent duct and can extend beyond their respective duct sides to overlap at two corners of the duct to provide a supporting grid including the end portions of each of two rods extending from two corners of the duct. A grease absorbing pad is supported on the supporting grid disposed adjacent a side of the duct. The pad can be of sufficient length to extend beyond the duct side on both ends.

Abstract: The energy required to provide hot water may be reduced in a water heating system including a heat generating range (12) for cooking food and a hood (14) overlying the range (12) for capturing fumes rising from the range (12) or the food thereon. An exhaust duct (16) provided with an exhaust fan (18) is connected to the hood (14) and a baffle and heat exchanger assembly (22) is interposed between the hood (14) and the exhaust duct (16). The assembly (22) includes a grease collecting baffle (54) facing the hood (14) and a heat exchanger (52) backing the baffle (54). The heat exchanger (52) includes a liquid flow path (56), (60), (74) through which water to be heated by the fumes may circulate.

Abstract: An apparatus for collecting grease from a kitchen ventilator, which is mounted on the roof of a structure housing a restaurant. The apparatus fits around the exhaust fan of a kitchen ventilator and includes at least one layer of filtering medium which fits snugly about the exhaust fan, a rectangular frame for securing the layer of filtering medium about the exhaust fan, and a plurality of retaining bars for securing the layer of filter medium in the rectangular frame. The rectangular frame is comprised of four frame sections joined at each end with 90.degree. elbows. Each frame section comprises three tubes with supports fitted between the tubes. The 90.degree. elbows fit over and join the tubes of one frame section with the tubes of another frame section. The retaining bars are positioned between two tubes of opposing frame sections, above the layer of filtering medium.

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: The energy required to provide hot water may be reduced in a water heating system including a heat generating range (12) for cooking food and a hood (14) overlying the range (12) for capturing fumes rising from the range (12) or the food thereon. An exhaust duct (16) provided with an exhaust fan (18) is connected to the hood (14) and a baffle and heat exchanger assembly (22) is interposed between the hood (14) and the exhaust duct (16). The assembly (22) includes a grease collecting baffle (54) facing the hood (14) and a heat exchanger (52) backing the baffle (54). The heat exchanger (52) includes a liquid flow path (56), (60), (74) through which water to be heated by the fumes may circulate.

Abstract: An exhaust hood is disclosed which comprises an open underside and a grease filter defining an exhaust plenum between the hood and the grease filter and a flow path through the grease filter. A shutter-like panel is slidable into the flow path adjacent to the grease filter for blocking a portion of the flow path to adjust a volume of air flowing through the exhaust hood. Multiple side-by-side panels may be provided and each panel preferably tapers in height across its width.

Abstract: A grease filter assembly is provided for absorbing airborne grease discharged from a grease discharge vent extending from a roof. A support frame is mountable to the duct of the grease discharge vent and grease absorbing pads are supportable upon the support frame in stationary position surrounding the discharge vent and in spaced relation from the roof. The support frame includes support rods mounted adjacent respective sides of the discharge vent duct and extending beyond their respective duct sides to overlap at the corners of the duct and thereby provide a supporting grid including the end portions of each of two rods extending from adjacent walls of the duct. A plurality of grease absorbing pads are supported on the supporting grid disposed adjacent respective sides of the duct. The pads being of sufficient length to extend beyond the duct sides on both ends so that pads disposed at adjacent sides of the duct overlap one another at the corners of the duct.

Abstract: A smoke exhauster comprises a filtration member of a rectangular framelike construction. The filtration member is disposed in the smoke exhauster such that the periphery of the filtration member urges the inner wall of a stopping portion of the base board of the smoke exhauster, and that the top and the bottom of the filtration member are attached respectively to the bottom of the bottom board of the smoke exhauster and the top of a main plate portion of the base board of the smoke exhauster. The filtration member serves to purify the fume so as to reduce the discharge of the air pollutant into the atmosphere.

Abstract: An apparatus for filtering grease laden fumes in the space above a cooking appliance, including a hood, a supply air plenum and an exhaust air plenum on each side of the hood, a source of air under pressure being connected to a supply air transition duct connected by an air supply transition duct coupled to an opening in the air supply plenum, the supply air plenum being provided with perforated balancing plates which perform the function of modulating the incoming air to flow in a particular manner, and further being provided with perforated deflector pairs of overlapped plates positioned below the balancing plates, to additionally modulate the air flow paths, so that straight paths of air flow move into the interior of the hood above the cooking appliances and then pass through filters which remove grease particles as the exhaust air moves through the filters into the exhaust air plenum.

Abstract: A combined self-cleaning grease and particulate filter and heat exchanger used to collect thermal energy normally vented through flue hoods or other ventilation systems in commercial or institutional kitchens. Fluid circulated within the filter/heat exchanger may then be utilized for heating other mediums, such as water or air. The filter/heat exchanger is provided with means for quick assembly and designed to replace existing grease filters, thus allowing economical retrofitting.

Abstract: Organic vapors emitted from a fryer containing a fatty substance heated to its vaporization temperature are condensed from a stream of exhaust air by a venturi-type scrubber. The scrubber condenses organic vapors into a liquid bath from which floatable by-products are removed and subjected to a further separation or clarification process. Air containing organic vapors is initially collected by a hood structure which defines a substantially confined emissions region above the fatty substance. In a preferred embodiment, the hood structure is configured to restrict the flow of ambient air into the emissions region, preferably causing air to enter the emissions region at a velocity of at least approximately 100 feet per minute.

Abstract: Removable filters tailored to pollution by different cookers under a hood, have locating punched out notches on locator pins located on a removable drain trough according to a pattern whereby, after the filters are removed for cleaning, they must be re-installed in their original locations. A field-installed outlet collar assembly includes a flanged one-piece inner collar received up through a field-cut opening in the hood top. Two tapered half frames are hammered in laterally, wedging between the top of the hood and the top flange of the collar, sealing the bottom flange of the collar to a gasket sealed to the underside of the hood top. An access door assembly is similarly field-installed. Exhaust duct sections have joint features snapped together and interlocking.Fire damper assemblies inside the exhaust and make-up air plenums include horizontally slidable panels positionable in a maximized standardized hood to reduce its flow rates to match specific cooking fume ventilating requirements.

Abstract: An improved fume exhauster includes a housing forming therein a receiving space in which a suction and filtration unit is disposed. Fastened to the lower portion of the receiving space of the housing is a bottom plate having a fume sucking hole and a plurality of air exit holes arranged at a predetermined interval along left, right and front edges thereof. The fume is sucked in through the fume sucking hole of the bottom plate and is subsequently filtered by a filtration member. The filtered fume (clean air) is caused to pass through the air exit holes to form an air curtain under the fume exhauster. The air curtain acts to prevent the dissipation of the fume so as to reinforce the sucking and exhausting effect of the fume exhauster.

Abstract: A vapor-collecting hood for a commercial kitchen has downwardly open collecting vapor spaces formed by the grease separating cells which have intake openings adapted to be selectively blocked by shutters. All of the shutters are mounted upon a common shutter carrier and are displaceable therewith from positions in which the openings are unblocked into positions in which the openings are blocked.

Abstract: An automated deep frying system includes a refrigerated food storage compartment having a portion controller and dispenser, an isolated cooking chamber having a frying vessel and a food basket which is movable to a variety of preselected positions for loading, cooking and dispensing the food, and an air purifier including a flat cold surface for isolating the by-products of the frying process. The system also includes a microprocessor controller which is programmed for the system operation, including automatic dispensing, preparation and serving of preselected portions of food in response to an operator's input, as well as energy efficient control of the refrigerated food storage compartment and the air purifier cold plate.

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: A device for intercepting and collecting fats and/or moisture dispersed in an ascending gaseous carrier has a set of trough-shaped collecting elements which alternate with and whose marginal portions are overlapped by inverted trough-shaped intercepting elements. The lowermost sections of the collecting elements form part of shallow receptacles for collected fats and/or moisture, and such receptacles extend between end walls which are of one piece with the ends of main portions of the collecting elements. Such collecting elements can be produced by deep drawing suitably configurated blanks of sheet metal. The end walls and the marginal portions of the collecting elements have projections extending through slots in plate-like holders for the collecting elements.