Abstract: An adapter manifold to supply untempered outside air to a kitchen or other ventilating hood is in the form of an elongated box structure which has a plurality of serially arranged outlets communicating with the interior of the manifold and extending outwardly therefrom. The adapter manifold is connected to the existing hood by cutting holes in the front wall of the hood so that the manifold tubes can project into the hood and direct streams of outside air against the grease filter. The adapter manifold enables use of outside air to facilitate exhausting of fumes and odors without causing loss of substantial amounts of tempered or conditioned inside air.

Abstract: The specification discloses an exhaust ventilation system with a vented hood arrangement over a cooking area which is controlled automatically by the presence of a cook at a cooking station. The primary exhaust fan is automatically turned off a predetermined period of time after the cook has left the cooking station. A fresh air fan is similarly controlled by the presence of the cook at the cooking station. An auxiliary exhaust fan is automatically energized and deenergized in response to the operation of the primary exhaust fan, such that the auxiliary fan is on when the primary exhaust fan is off and vice versa.

Abstract: A filtration device which comprises a frame having a plurality of nozzles that are opposed but shifted aside relative to one another. The boxlike frame is composed of a first frame having a U-shaped cross-section and a second frame having an inversely U-shaped cross-section, both the first and second frames being provided with joining projections. A plurality of intake tubes in conical shapes are arranged on the inside of the first frame in a manner like a checkered pattern and the cross-section of each intake tube is enlarged in the suction direction and reduced in the exhaust direction. A plurality of outlet tubes projected downward and having fins at their lower ends are attached to the inside of the second frame. These outlet tube group is also arranged like a checkered pattern and shifted aside relative to the other nozzle group on the first frame.

Abstract: A grease extraction cartridge for a kitchen exhaust ventilator is removably disposed along a flow path through the ventilator for normally forming a fire wall, while being readily removable from the ventilator to permit access to the interior of the ventilator for purposes of cleaning and maintaining the device.

Abstract: The invention relates to a new device for discharging smokes, fumes and greases from various indoor premises and comprising a set of ceiling elements arranged with smoke, fumes and grease discharging slits therebetween.It is characterized in that the ceiling elements it includes are hollow and crossed by water whose circulation is ensured by pipes interconnecting the elements, which elements form condensers with water-cooled heat-transfer surfaces.Discharging of the grease deposits collected on the condensers is effected by washing with water containing a detergent, this water being supplied by spray-rails, while the washing water and the dissolved greases are collected by the drains.Hoods are provided above the slits separating the drains (the later being close to one another) in order to completely secure the premises against dripping of the greases and washing water during the cleaning operation, which is performed only when it proves necessary.

Abstract: A subceiling 10 for kitchens and the like includes upwardly arched condenser panels 12 whose free edges are disposed above hollow, U-shaped collecting channels 14. The interiors of the channels may be supplied with cold water to promote condensation or with hot water to melt and drain off fatty deposits.

Abstract: The apparatus is capable of depurating the air of small-sized ambients or oms, such as kitchens, rooms situated on board of vehicles, etc. and it comprises a housing A for a ventilator or fan 10-12 having a vertical axis and which shows two distributing chambers 16-28. The said chambers are in communication with the room and with the atmosphere and, through commutatable intercepting members 22-38, with the delivery and the intake of the ventilator, while part of the openings of the above mentioned distributing chambers are provided with heat sources 20-46, either to heat or to cool the air which is insufflared into the ambient or room concerned.

Abstract: A kitchen ventilator designed as a regularly shaped box having six flat sides and substantially no projecting parts. The spiral fan housing walls extend all the way between the ventilator top and bottom walls, all other components of the ventilator being located radially outside the fan housing.

Abstract: A kitchen exhaust system has an outside air supply blower and a hood exhaust blower discharging outside. 80% of the air discharged by the exhaust blower is taken from the intake blower through cooktop level and overhead supply outlets in the hood, and 20% is taken from the room. The supply discharge outlets are arranged to provide a venturi action removing smoke and fumes from over the cooktop.

Abstract: The specification discloses a kitchen stove hood having two venting modes of operation. The kitchen stove hood is dimensioned to be disposed in a kitchen area over a stove and includes an air intake opening. An air recirculation outlet for recirculating filtered air to the kitchen area and an air vent outlet for venting air from the kitchen area is also included in the kitchen stove hood. A recirculation damper blade is mounted adjacent to the air recirculation outlet and is operable between an open and closed position. A vent damper blade is mounted adjacent to the air vent outlet and is operable between an open and closed position. The damper blades are interconnected by a damper blade linkage assembly which is operable to positively move the recirculation damper blade between its open and closed position while simultaneously moving the vent damper blade between its closed and open position.

Abstract: The grease hood has a small dimension in the front-to-rear direction, and encloses a relatively large vortex the maximum vertical dimension of which is about equal to or greater than the maximum horizontal dimension thereof. The maximum diametral dimension of the vortex in a direction generally perpendicular to the grease-filter means is about equal to or less than the maximum diametral vortex dimension in a direction generally parallel thereto. In one illustrated embodiment, the vortex is generally circular, whereas in a second illustrated embodiment the vortex is generally elliptical and vertically elongated.The grease-filter means in one illustrated embodiment is not planar but instead is curved, the curvature cooperating with the curvature of the vortex liner to permit achievement of benefits including relatively small size of the grease hood. More specifically, the curved filter is associated with the vortex liner of generally circular shape in such one embodiment.

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.

Abstract: A method of removing aerosol particles as well as larger particles from the emissions of kitchens of restaurants, particularly those used in the fast food industry, comprising collecting the smoke and other gases rising from the kitchen cooking area and passing the smoke and other gases containing aerosol size liquid and solid particles through a coalescing filter which coalesces and removes from the air stream the aerosol particles of 3 microns and smaller as well as particles of larger size. The apparatus includes a hood positioned above the cooking area of a kitchen, a ventilation duct connected to the hood for conveying gases collected by the hood to the atmosphere outside of the kitchen, an aerosol particle coalescing filter enclosed within the ventilation duct, a blower connected with the ventilation duct for drawing gases from the hood through the duct and filter and for discharging the gases into the atmosphere outside of the kitchen.

Abstract: A kitchen ventilator has a first outlet for connection to an evacuation duct and a second outlet for recirculation air. The pressure side of the fan is connected to these outlets by means of a valve. A duct from the valve to a odor removal filter adjacent the second outlet forms a plenum chamber, the bottom of which is the bottom wall of the ventilator housing. In this bottom wall openings are provided for producing a downwards flowing air curtain only when the valve is set for recirculation.

Abstract: A kitchen ventilator has a first outlet for connection to an evacuation duct and a second outlet for recirculation air. The pressure side of the fan is connected to these outlets by means of first and second air ducts, respectively, located side by side in the ventilator casing. A valve flap with vertical pivot axis is located at the duct fork and immediately adjacent the bottom wall of the casing and is directly adjustable from below the casing by means of a turning knob accessible through an opening in said bottom wall.

Abstract: An induction heating apparatus comprising a pair of inversely parallel-connected gate-controlled switching devices connected to an alternating current source, a resonant circuit including an induction heating coil and a variable frequency gating circuit for firing the switching devices to generate oscillations through the conducting device and the induction heating coil. The switching devices are gated into conduction in succession in a first order during the positive half cycle of the alternating current and in a reversed order during the negative half cycle. A zero crosspoint detector is provided to inhibit gating when the source voltage is near zero crosspoint level and to control the gating frequency in accordance with the instantaneous value of the source voltage to increase the turn-off time of the switching devices for lower input source voltage.

Abstract: A ceiling mounted kitchen ventilator has inlet openings in opposite sides of a vertical exhaust duct for drawing in gases and vapors rising from underlying cooking equipment. The inlet opening on one side is adjustable to vary the ratio of the two opposed confluent flows into the duct. A ceiling mounted canopy surrounds the exhaust duct and overhangs the cooking equipment to capture the contaminated air for treatment and disposal by the exhaust duct. The canopy also provides fresh air make-up for the kitchen, to replace the air removed by the exhaust duct.

Abstract: A grease extractor apparatus having a housing, a hood, a first chamber connecting with air and grease vapors entrained by said hood, a cold water spray nozzle system and a hot water wash system associated with said chamber, a sump at the bottom of said chamber for collecting solidified grease vapors, a second chamber connecting with said first chamber and having additional wash nozzles incorporated therewith, a third chamber for having turbulent flow therein and connected with said second chamber, a duct leading from the third chamber to an expansion chamber the expansion chamber having an airflow baffle and third wash nozzles incorporated therewith, and an exhaust duct from the expansion chamber connected to a suction fan and a fire damper means therein.

Abstract: This invention relates to a kitchen ventilating system, where a kitchen hood communicates through an exhaust duct to the exterior atmosphere, where a fan in the duct operates for powered venting of the kitchen, and where a damper can be closed to separate the kitchen from the exhaust duct. This invention teaches means for shifting the damper between the closed position and the open position, which means is a fluid power actuator in the form of a power cylinder. The power cylinder is operated by water, typically from the same source as the regular kitchen water, and control valve means utilized between this source of water under pressure and the cylinder controls the shifting of the damper. The preferred system provides that the valve means shifts by spring pressure to the position corresponding to where the damper is closed and is electrically shifted to open the damper, so that should a power failure occur the damper will automatically be closed.

Abstract: An exhaust hood with filter apparatus and having at least a fume collection chamber, an exhaust chamber and an interior wall therebetween having an opening therein through which the collected fumes may pass to exhaust. An exhaust filter exchanger is mounted in the exhaust chamber and has at least two filter holders each for holding at least one filter, with one of the filter holders being in an operating position across the opening in the wall between the two chambers and the other of the filter holders being in a reserve position within the exhaust chamber. The filter exchanger apparatus allows an attendant to retract, rotate, and extend the filter holders (and filters therein) to exchange their positions. Spray nozzles are provided within the exhaust chamber to wash the filters held in the reserve position without removal from the hood.

Abstract: An environmental hood and duct structure for griddle and the like cooking equipment used in restaurant and similar facilities, for degreasing the air ambient to the cooking equipment, including a hood arrangement defining a water spray chamber having an air intake opening overlying the cooking surface of the cooking equipment involved, in which air intake opening is mounted an upwardly inclined grilling formed to define a plurality of individual grille openings shaped to provide a venturi effect on the air passing therethrough. The air is drawn across the cooking surface and into and through the grilling at a rate on the order of 1,000-3,000 cubic feet per minute, with the venturi affected air, on passing into the spraying chamber, being subjected to a cool water spray for wet scrubbing of the grease from the air. The scrubbed air is discharged to the atmosphere.

Abstract: Ventilating apparatus having an exhaust hood for mounting above a stove, grill, or other apparatus. Ambient air from outside the room being ventilated is forced into an insulated intake chamber within the exhaust hood through a relatively narrow longitudinal slot at the bottom of the intake chamber, thence directed rearwardly and upwardly across a fume collection chamber, through a grease filter, and into an exhaust chamber from which the fumes are exhausted to the atmosphere by a fan. The outside air is forced through the slot in a fast moving narrow stream to form an air curtain across the fume collection chamber with minimal mixing of the fume laden air and the air curtain. Tempered air is introduced into the room being ventilated adjacent the exhaust hood to provide a minimum influx of tempered air from the room being ventilated into the hood to prevent dissipation fumes into the room, and to facilitate collection of such fume laden air by the exhaust hood.

Abstract: A compact hood assembly is provided for use with griddles and other types of cooking range units which generate grease-carrying vapors. A vapor treating section overlies the rear part of a range unit to receive vapors into a vapor treating zone into which water is sprayed with grease-carrying water being collected in a trough, and a water treating section is disposed alongside the range unit and includes a tank receiving water from one side of the trough with the water being pumped from the tank to spraying means of the vapor treating section. Important features relate to the construction, disposition and operation of baffle means which extend downwardly and forwardly toward the trough means and which includes spaced vanes, the baffle means including one or more sections which are removable for cleaning and for access to the interior of the vapor treating section.

Abstract: An exhaust hood vented to the atmosphere comprising a double-walled stack and a double-walled hood structure where the gap between the walls of the stack and the hood are arranged for communication. A first blower is mounted on the exterior end of the stack for ingesting exterior air into the gap between the walls, with this ingested air flowing downwardly to be injected along the interior surfaces of the hood. A second blower is mounted in the stack for withdrawing the combination of the injected air and any fumes collected in said hood.

Abstract: The entry or intake portion of a grease-hood system is mounted at a low elevation, far below the elevation of the head of the cook. Furthermore, such entry portion does not extend clear to the front of the cooking appliance disposed therebeneath, thus the cooking appliance protrudes outwardly from beneath the entry portion. The apparatus and method are such that the flow of fumes and air from the cooking appliance to the entry portion of the hood is substantially entirely the result of convection. There is, however, a forced flow in the hood system at a region above the entry portion, the forced flow being such that fumes and air are directed at the grease filter means. In the forced-flow portion of the system, air from outside the room is passed directly to the grease hood, and air and fumes which pass through the grease filter means are passed to a region exterior to the room and/or are recirculated back to the hood. There is a vortical flow of air and fumes in the forced-flow portion of the system.

Abstract: A hood assembly for use with cooking equipment having a plurality of units for separating foreign matter from air moving through the hood assembly. Each unit has a cylindrical tubular member having a passage for carrying the air and entrained foreign matter. A plurality of helical elements are located in the passage. The adjacent helical elements are located in 90.degree. relationship relative to each other so that the air moving through the passage is divided into separate helical paths which direct the air in spiral patterns whereby the foreign matter is separated from the air by the mechanisms of centrifugal force, adhesion and impaction. The foreign matter is collected and carried to a container. The cleaned air is recycled into the environment surrounding the hood assembly.

Abstract: This invention relates to a ventilating system used for withdrawing cooking fumes from a kitchen, teaching an improved fire rated centrifugal grease extractor and flow control damper arrangement at the inlet to the extractor.The disclosed centrifugal grease extractor structure defines a tortuous airflow path between the inlet opening from the kitchen and the exhaust duct that leads to the outside atmosphere. This tortuous path defining extractor structure includes downwardly pitched bottom and top walls and interconnected vertical side walls and a vertical rear wall, and upwardly and downwardly depending baffles formed from these walls and by the flow control damper when opened.

Abstract: The makeup air device includes a front chamber, a lower wall of which is adapted to force rising smoke and the like into an intake of a grease extraction ventilator. A depending passage at the lower front of the device has an air outlet which discharges air toward the ventilator intake. An adjustment baffle having a forwardly slanted lower flange is moved in the outlet between a position of maximum flow and a position of no flow. Louvers in the front wall of the chamber above the passage are adjustable, so that different amounts of fresh air may flow into the room in which the cooking equipment is placed.

Abstract: An exhaust fume treatment apparatus for removing suspended or entrained material from a gas including a substantially cylindrical housing having a peripheral wall and inlet and outlet openings in opposite end walls. A slinger wheel is rotatable within the housing and has circumferentially spaced, nonoverloading blades. A blower has its inlet connected to the outlet of the housing. Polluted fumes are drawn into the housing by the blower and pass outwardly through the slinger blades whereby the materials in the gas are deposited on, and thrown substantially radially outwardly by the blades, toward the peripheral wall of the housing for collection. A two stage gas deflector within the slinger wheel spreads the flow of gas more uniformly over the slinger wheel blades. A cylindrical screen encircles the slinger wheel and has plural openings angled toward the housing inlet end.

Abstract: A false ceiling (10) includes a plurality of concave panels (12, 60) having liquid spray nozzles (40, 62) at their crowns. The liquid streams down the undersides of the panels to collecting channels (16) and carries with it particles of dirt, grease, etc., entrained in vapors from kitchen burners or the like below. Air is exhausted through the spaced openings between the edges (14) of the panels and the sides (18) of the collecting channels.

Abstract: Ventilating apparatus having an exhaust hood for mounting above a stove, grill, or other apparatus from which fumes arise. Ambient air from outside the room being ventilated is forced into an insulated intake chamber within the exhaust hood through a relatively narrow longitudinal slot at the bottom of the intake chamber, thence directed rearwardly and upwardly across a fume collection chamber, through a grease filter, and into an exhaust chamber from which the fumes are exhausted to the atmosphere by a fan. The outside air is forced through the slot in a fast moving narrow stream to form an air curtain across the fume chamber with minimal mixing of the fume laden air and the air curtain. Tempered air is introduced into the room being ventilated adjacent the exhaust hood to provide a minimum influx of tempered air from the room being ventilated into the hood to prevent dissipation fumes into the room, and to facilitate collection of such fume laden air by the exhaust hood.

Abstract: A flame retarding filter device is disclosed for use in an air exhaust system wherein the exhaust air carries grease particles and the like susceptible to combustion. The device has first and second rows of spaced parallel baffle elements each of which has a generally planar central portion and inclined longitudinal edges. The rows of baffle elements are supported in spaced relation with the baffle elements of the rearward row overlying the spaces between the baffle elements of the front row in a manner to retard the passage of flames through the device while allowing sufficient free flow of air through the unit to exhaust heat and odors from the room in which the device is employed.

Abstract: Disclosed is a free standing cooking fume and odor collecting or ventilating unit of modular construction and adapted for positioning adjacent one or more fume-generating cooking surfaces, which may be at differing vertical levels. The exhaust fan and motor, and suitable intake filters are located in the lower portion of the assembly and this lower portion accommodates, in overlying relation, one or more alternative intake modules which include intake openings adjacent the cooking surfaces or other fume producing portions of the ranges adjacent to which the collecting unit is placed.

Abstract: A greatly extended plenum chamber, comprising a plenum or exhaust chamber and a plenum extension connected thereto, is employed in combination with grease filters which operate by impingement and by centrifugal action. Furthermore, a stream of air is directed against the upstream surfaces of the filters. The result of the combination is a surprisingly effective removal of grease and smoke from cooking fumes, with consequent minimization of grease coatings on the surfaces of the plenum chamber and of the exhaust blower connected thereto. When space does not permit vertical installation of a large extended plenum chamber, portions of such chamber may be inclined from the vertical and/or may be replaced by a plurality of smaller plenum extensions.In an additional embodiment, the effect of a very large plenum extension is obtained by a single and much smaller plenum extension.

Abstract: A workspace, within a building where a process is practiced by which airborne liquid particulate grease is generated, is ventilated by an apparatus and in accordance with a method by which air is induced to flow at conveying velocity from the workspace into an unrestricted hood and through an unrestricted duct to a location remote from the workspace, entraining airborne liquid particulate grease with the air and thereby unrestrictedly conveying entrained grease from the workspace to the remote location. At the remote location, the flowing air and conveyed grease is directed into a collection chamber and there guided along an at least partially circular, sharply turning flow path while first accelerating and then decelerating the velocity of flow thereby separating the conveyed grease from the flowing air. The separated grease is retained in the collection chamber while the flowing air which conveyed the grease to the chamber is passed to the ambient atmosphere.

Abstract: A vortex-type smoke hood, in which the liner of the hood is substantially continuously curved in such manner that the vortex action is improved greatly. One result is that the supply air velocity may be increased by a major amount, without causing "bouncing" of air and fumes out of the hood. The curved wall produces the additional benefit of rendering more smooth the flow path of the inlet air.In a second embodiment, a plate shelf and/or pass-through are combined with the hood, creating a very convenient relationship and one whereby the cook remains highly comfortable.

Abstract: An exhaust hood over a cooking appliance has sides that extend down substantially closer to the cooking surface than does the front of the exhaust hood. A wall slants forwardly and upwardly from the rear of those sides to the top of the hood adjacent the front thereof. This wall has an opening through which the fumes are drawn to an exhaust duct, and a grease extractor positioned across that opening. At the front of the hood a baffle extends between the sides and rearwardly from the front of the hood in a horizontal direction.