Abstract: A roaster for roasting meat is proposed. Smoke emitted by meat while it is roasted is drawn into a smoke intake flue through a pair of openings provided along and over the longitudinal edges of a rectangular griddle. Then the smoke is purified by a smoke purifier disposed under the griddle.

Abstract: The invention is an oven ventilation system which uses sheets of moving air to remove heat and also to insulate the oven from the remainder of the room or vehicle in which the oven is located. More particularly, the ventilation system takes air from outside the room or vehicle and forms rapidly moving sheets of air which pass over the external surfaces of the oven. After passing over one or more of the external surfaces of the oven, the sheets of air are exhausted to the outside. Preferably, the ventilation system also comprises wall means for forming a chamber to separate the oven and ventilation system from the remainder of the room or vehicle.

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 range hood (2) mounted above a kitchen range (4) includes one or more storage shelves (6, 8) in the hood. An adjustable tilt-out front panel (22) is adaptable to include openable doors (24) for accessing the shelves, and is operated by a user between a position flush with adjacent cabinetry (20) or the like, and an extended position increasing the vapor collection area above the range. A gravity operated baffle (30) maintains integrity of the collection area liner by covering the additional collection area when the front panel is in the tilted-out position or any position inbetween. The housing (14) for the hood has an upper portion (16) and a lower depending portion (18) adjustably mounted to the upper portion to provide an adjustable overall vertical height. A hood mounting system provides built-in three dimensional adjustment and allows an installer to restrict adjustments to a single plane at a time for final fine tuning adjustment.

Abstract: Disclosed is a room exhaust duct for collecting and exhausting grease, smoke, heat, steam and odors emanating from cooking food at a cooking table. The room exhaust duct has a hood, flexible duct and adapter duct assembly connected and in communication with the adapted duct assembly connected to and in communication with a permanent ceiling exhaust duct. A reversible hoisting motor is switch-operated and is mounted on the adapter duct assembly. The motor drives a drum reel to wind up or lower a cable connected to the hood to position same in various positions including the fully retracted position of the hood providing unobstructed and esthetically pleasing room space and the fully lowered position of the hood to maximize the collecting and exhausting of such grease, smoke, heat, steam and odors.

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: Improved air flow characteristics are obtained in a ventilating hood of the make-up type used over cooking surfaces by providing an air distribution panel comprising a panel frame to which is mounted a duct which serves to partition air flow between a first path exterior to the duct and a second path through said duct. A first air flow restricting screen is mounted to the panel frame externally of said duct for restricting air flow through the first flow path, and a second air flow restricting screen is mounted within said duct for restricting the air flow therethrough. The duct includes an internal wall surface which is angled towards the first flow path so as to direct air flow through the duct into merger with air flowing through the first flow path.

Abstract: An exhaust device comprising an elongate hood having side walls (3,4). An internal, centrally located deflection casing (10) has two mutually aligned suction openings (8,9) which, in combination with an air-supply device (6) disposed at the bottom of the hood, causes the generation of two axially aligned rotational flow patterns (P2, P'2) in the hood between each side wall (4,3) and the central deflection casing (10), from which polluted air is exhausted (via 11,12).

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: An air scrubber apparatus which purifies foul air produced during an embalming or an autopsy carried out on a work table disposed in a room. The scrubber apparatus comprises a housing positioned above the work table, this housing having a first and a second side corresponding to a first and a second side of the work table, respectively. The housing defines from its first side to its second side a first longitudinal outer compartment provided at its two ends with outlets to the room, a central compartment having no bottom wall for thereby providing this central compartment with a wide bottom opening to the room, and a second longitudinal outer compartment also provided at its two ends with outlets to the room.

Abstract: In a ventilating hood of the type incorporating a supply chamber, an exhaust outlet, one or both of which incorporate air blower or moving means, such as fans, pressure taps are incorporated at strategic locations about the supply and exhaust chambers, generally at the location of their separating partitions, as where the air is diffused as passing through the hood, so that pressure drops can be readily determined, and airflows at these locations may be properly set as determined from previously prepared graphs.

Abstract: A cooking appliance unit including a top plate on which food items are cooked, a horizontal frame formed around the outer periphery of the top plate, having inlet and outlet ventilation holes on only one side thereof, and a cooking appliance body below the plate and frame having walls defining first, second and third chambers therein. A heating device is provided in the second chamber below the top plate. A control device is provided in the first chamber, the first chamber being in fluid communication with the inlet holes, and the second chamber through a ventilation opening in a partition wall. The third chamber is disposed below the second chamber separated by another partition wall which contains a cooling fan, the third chamber being in fluid communication with the exhaust holes.

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: An oven ventilating system is provided for use in conjunction with a proximity ventilated range having modular plug-in cooktop cartridges. A vent tube extends upwardly from an oven vent outlet to a position adjacent the air intake grill. The venting path, in one embodiment, is completed by a collar-like chimney portion of the air intake grill which cooperates with the top of the vent tube to conduct exhaust fumes to above the top surface of the range.

Abstract: The present invention relates generally to an indoor barbecue griller in which substantially all fat and other cooking residues are vaporized. Previously it had been the custom to catch fat and the like in a tray under the heating means for later withdrawal. Due to the fire risk, it had previously been the practice to keep the container and its environs as cool as possible. The present invention provides that the collection receptacle take the form of an absorbent tray which is heated by reflection and refraction from the heating means and refractory material, said tray being surrounded by a heavily insulated enclosure provided with copious quantities of air to assist instantaneous combustion. A plenum chamber assists the control of combustion of said residues.

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: 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: 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 ventilation system for use with devices which produce airborne impurities, particularly cooking grills, deep fat fryers and the like. A first blower supplies untempered makeup air. A first plenum, which includes a first perforated wall having a plurality of openings therein, supplies air from the first blower, via a duct, into space beneath an upper front portion of a hood. A second plenum, which includes a second perforated wall having a plurality of apertures therein, supplies air from the first blower, via a duct, into space beneath the hood to cool air and impurities, which may include flue gas, moving upwardly in space adjacent the second perforated wall, the apertures in the second perforated wall being positioned to discharge air substantially horizontally into this space. A second blower is provided for exhausting air and impurities from the hood via a duct and an exhaust plenum.

Abstract: A recycle water treatment system for separating oil vapor from steam recovering the oil and heat from the steam and destroys microorganisms and exotoxins which incorporates an inclined duct connected to a barometric condenser with a container for oil at the lower end of the condenser. Oil entrained in the steam is carried up the duct and over the barometric condenser. The steam heats the condenser water that is recovered while the entrained oil flows back down the duct into a recovery container. The condenser water-steam condensate mixture is maintained at about 180.degree. F. for a period of time sufficient to destroy microorganisms and exotoxins.

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: An apparatus for cooking food and extracting smoke is disclosed comprising a grill for use with a heat source, the grill having an upwardly convex cooking surface with ventilation holes formed therein and a peripheral groove for collecting food juices, and further comprising a hood for collecting smoke supported above a grill on a cooking table and duct work leading from within the hood, through the table and away to external exhaust. The apparatus is suited for restaurant dining room use.

Abstract: The electronic components in the cavity of a modular induction cooktop cartridge are cooled as a result of ventilation provided by a proximity ventilation system. The cooktop cartridge is raised relative to the surface of the range and ports are provided on opposite sides of the cartridge in the raised portion whereby the proximity ventilation system educts air from the cavity and thereby causes an air circulation path through the cavity.

Abstract: The blower is made separate from the rest of a self-ventilated range and is installed prior to the installation of the range. The blower can be selectively mounted for through-the-wall or through-the-floor discharge and is located so that the hole in the wall or floor misses the studs or joists, respectively. After the blower is installed, the self-ventilated range is set in place over the blower and the blower is connected to the plenum by means of a flexible pipe. In this way the plenum can be made thinner providing more room for the oven cavity.

Abstract: A system of combining a microwave oven and ventilator over a range top or the like wherein the ventilator comprises an assembly including a central oven receiving compartment and air handling components providing for an exhausting of the range top atmosphere and a maintenance of the oven in a relatively contamination free environment. The ventilator includes a downwardly directed filter-mounting cavity underlying the oven. A pair of vertically extending air directing channels are provided to each side of the oven receiving compartment and extend vertically from communication with the underlying cavity to a pair of chambers located above the oven compartment and in direct communication with an exhaust blower positioned centrally therebetween. The exhaust blower is communicated with the ambient atmosphere above the oven compartment for introduction of cooling uncontaminated air.

Abstract: Disclosed is a proximity ventilated cooking range adapted for countertop installation in a conventional stack-on kitchen cabinet. The surface heating units and ventilating air intake rest over a cut-out portion of the cabinet countertop with a ventilating air plenum and motor driven fan depending from the top surface of the range and disposed in the underlying cabinet. A housing enclosing an electronic air filtering unit is mounted closely adjacent the ventilating air plenum with a duct connecting the discharge of the fan and the interior of the filter unit housing. After moving through the filter unit, the air exits from the housing through a discharge opening at the front of the cabinet into the kitchen environs.

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 downwardly and forwardly open shroud for a cooking station converges rearwardly and upwardly toward an outlet duct. A throat region of the shroud is provided with a removable panel having a slotted baffle. A gutter and sump are provided for catching condensate, grease and the like. The panel is easily removed for cleaning, for exchanging with a similar panel having a different size and/or shape of slotted baffle and the sump is placed for easy cleanout. Versions are shown wherein the shroud is wall-mounted at the cooking station or cart-mounted together with a mobile cooking station.

Abstract: A ventilation system for institutional and commercial cooking equipment includes a hood which is placed over the equipment and which attaches to an exhaust duct and fan that removes a relatively constant volume of air from beneath the hood. A make-up air supply divides to form a fresh air duct that connects to the hood and a tempered air duct which also connects to the hood. The fresh air is directed beneath the hood by fresh air registers and the tempered air is directed into the surrounding room by tempered air registers. The relative amounts of fresh air and tempered air can be changed by a damper, but the damper does not significantly alter the total amount of supplied make-up air. The system can thus be adjusted to use more or less tempered air as various combinations of cooking equipment are used without affecting the overall balance of exhaust air and make-up air.

Abstract: A method and apparatus for balancing the inlet air flow against the exhaust air flow in a system for exhausting contaminant-laden air from a work space. The volume of inlet air is controlled in accordance with its temperature so that the weight rate of air through the inlet fan is set at a value approximating the actual or a selected average value of the weight rate of air per minute exhausted by the exhaust fan.

Abstract: A false ceiling for use in removing and/or dissipating contaminants in a room including a plurality of ceiling elements, each of which has an arcuate configuration, the concave surface of which is directed downwardly, and the convex surface of which is directed upwardly, the ceiling elements collecting and draining off contaminants in the form of condensate into collecting channels which are supported by support members on which the ceiling elements are also supported, the ceiling elements being defined by spaced apart parallel arcuate walls that define an air circulating passage therebetween, a plurality of spaced openings being formed in each of the walls to permit the free flow of air therethrough, the location of the openings in one of said walls being staggered relative to the location of the openings in the other of said walls.

Abstract: A make-up air device for an overhead exhaust hood for a cooking range including a supply air plenum having a controlled air chamber in the outlet passage of the plenum for controlling the volume, velocity and direction of the flow of make-up air from the plenum over the cooking range. The controlled air chamber includes an upper inlet portion projecting into the air plenum space and including variably controlled damper blades. The lower discharge end of the control chamber includes adjustable louvers for controlling the direction of the discharged air. The adjustable louvers may be mounted in the bottom wall of the control chamber or the side wall. When the adjustable louvers are in the bottom wall, the side wall may be perforated to provide a by-pass flow. Moreover, when the adjustable louvers are in the bottom wall, a transverse perforated plate may be installed in the chamber between the inlet dampers and the discharge louvers in order to dampen the velocity of the air flow.

Abstract: An assembly for combining an appliance, for example a microwave oven, with a range vent hood having an appliance housing and a support structure for mounting the housing to a wall or to the floor of an overhead cabinet above a conventional cooking range is disclosed. The support structure includes a back wall upon which ribs are formed so as to space the rear of the housing from the back to form a channelized air space therebetween. A plate is attached to a lower portion of the back wall and extends forwardly toward and beneath the front of the appliance housing to form a second channelized air space between the plate and bottom of the housing. The two air spaces thus formed, communicate with one another to permit cooking gases and vapors from the range to be drawn upward through openings in the plate, then through the two air spaces and out the assembly on or near a top rear portion thereof.

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: A combination microwave oven and exhaust vent comprising a support assembly and a microwave oven operating module. The support assembly includes an open sided support enclosure into which the operating module is slidably inserted. The support assembly is initially mounted in the position above a countertop or cooking surface and the module is inserted thereinto to complete the mounting process.

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 separator for removing oil or fat particles from waste air, more specifically from a catering kitchen, has a system of generally parallel rods normal to the direction of the waste air current. The rods are distributed across the full cross-section of the waste air in the duct, and turbulence is produced in the waste air when it passes the rods so that oil and fat is entrained on the rods.

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: All the grease extracting baffles are incorporated in a single unit which is removable from the ventilator for cleaning. The baffle arrangement changes the direction of the whole flow of air through the ventilator without dividing the flow, as distinguished from removable grease extractors having a large number of narrow, zigzag baffles with narrow air slots between them and mounted in a frame similar to a porous filter frame.

Abstract: A range hood for an enclosure, which may be either ducted or ductless, comprises a hood having an inner compartment, said inner compartment having an air inlet aperture and first and second air outlet apertures; a blower means disposed within said hood and adapted to draw air from said enclosure through said air inlet aperture into said inner compartment and to discharge the air from said inner compartment through said outlet apertures; a damper member mounted for movement between a first position blocking said first outlet aperture, sand a second position not blocking said first outlet aperture, said damper member being normally biased to said first, blocking position; a first means for selectively locking or unlocking said damper member in said first position; and a second means for selectively opening or closing said second outlet aperture, such that, when said second outlet aperture is open and said damper member is locked in said first position, the air drawn into said inner compartment by said blower me

Abstract: A range ventilator is provided in a space with a heat exchanging partition between the contaminated exhaust air and the inflowing outside air. A duct for the exhaust air is formed between the heat exchanging partition constructed in the form of a cylinder of curved corrugated sheet metal and a cylindrical cover which can be disassembled into two halves, around the middle section of the sheet metal cylinder.

Abstract: Disclosed is an apparatus for conveying gases into or out of a specific area while at the same time providing illumination for the area. A lamp housing is adjustably mounted in a cap which is attached to the free end of a gas conveying pipe. The cap widens from a relatively small cross section area to a substantially larger cross section area with the lamp housing movable at least between a position in which it completely blocks flow through the small cross-sectional area of the cap and a position which, while still completely within the confines of the cap, permits the flow of gas therethrough. Specific embodiments of the invention include one in which the adjustable mount is controllable from outside the cap permitting ease of gas flow adjustment therethrough. Because the lamp housing is entirely contained within the cap, it is protected from inadvertent damage during careless handling in its vicinity.

Abstract: A new, safe and sanitary edge trim for use with commercial ventilation hoods usually located over stoves and ovens is disclosed. The edge trim is particularly suitable for use with ventilation hoods over cooking units where the fumes to be exhausted may carry large amounts of grease and/or fats. The trim of this invention includes a slit cylindrical stainless steel member which tightly fits over the edge of a side wall of the ventilator to which the trim is to be added. The cylindrical member is spot welded to the stainless steel ventilator sidewall with a stainless steel welding rod and a heli-arc welder at spaced locations along the joint. A bead of suitable grease or animal fat imperveous putty or other filler material is located on both surfaces of the ventilator side along the full length of the juncture of the ventilator side and the slit stainless steel cylindrical member.

Abstract: An apparatus and method are disclosed whereby both the inlet and exhaust plenums may be very "wide" (long), yet low in profile, economical to construct, and have very small tendencies to collect or be plugged with grease, while still achieving the important requisite of substantially uniform flow across the entire "width" (length) of the apparatus. One set of baffle or constrictor means is provided in the inlet plenum at regions between the inlet duct and the "sides" (ends) of such plenum. Another baffle or constrictor means is provided in the extended exhaust plenum, at regions between the exhaust duct and the central region of the grease-filter means. The respective baffle or constrictor means are relatively adjacent the ducts. The baffle or constrictor means are preferably fixed or adjustable baffles, or indentations (dimples) in the walls of the plenums. In one embodiment, an air-blocking plate is provided at the air-inlet throat on each "side" of the apparatus.

Abstract: An air filtration system for a cooking stove collects exhaust air from the stove with a vent hood, filters grease, particles and odors from the exhaust air and returns the filtered exhaust air to the room in which the stove is used. Exhaust air is cleansed of particles and odors by an activated charcoal filter within a return air conduit leading from the vent hood to the room. An electrically operated fan draws exhaust air into the vent hood, through grease filters and the activated charcoal filter and forces exhaust air back into the room. Regeneration of the activated charcoal filter is provided at selective intervals of time to maintain the effectiveness of the charcoal, and cooling of return air is provided for.

Abstract: Gases such as contaminated exhaust or stale air are induced toward a suction orifice by means of an air nozzle spaced from the orifice and pointing generally in the direction thereof to generate a Venturi effect on the gases at considerable distances from the suction orifice. An auxiliary plate extending generally parallel to and spaced slightly from the exposed wall of the air nozzle has one edge thereof positioned at a point farther away from the suction orifice than the outlet of the air nozzle, so that a secondary Venturi is generated and the capture point of the gases being collected is effectively moved further away from the suction orifice thereby improving the collection effect of the orifice.

Abstract: An air ventilation and washing system for extracting noxious or other impure air, such as is present above the cooking surface of a stove having automatically activated electrical and mechanical fire control apparatus selectively responsive to changes in temperature is disclosed. The air ventilation system has a hood structure providing a make-up air distribution plenum through which air is distributed and pressurized for equal distribution of make-up air along the length of the hood structure. A vortex baffle is provided in the hood between a make-up air cavity and an exhaust cavity to cause efficient mixing of room air and make-up air from the exterior, while protecting personnel from exposure to the exterior make-up air, and a vortex chamber causes the mixing of the make-up air and room air with contaminated air from the stove.