GB2578798A - Air treatment device and ventilation system - Google Patents

Air treatment device and ventilation system Download PDF

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Publication number
GB2578798A
GB2578798A GB1901291.3A GB201901291A GB2578798A GB 2578798 A GB2578798 A GB 2578798A GB 201901291 A GB201901291 A GB 201901291A GB 2578798 A GB2578798 A GB 2578798A
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United Kingdom
Prior art keywords
treatment device
air
air treatment
damper
filtration system
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Granted
Application number
GB1901291.3A
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GB2578798B (en
GB201901291D0 (en
Inventor
John Purnell Mark
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Honesta Ltd
Original Assignee
Honesta Ltd
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Publication date
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Priority to GB1901291.3A priority Critical patent/GB2578798B/en
Publication of GB201901291D0 publication Critical patent/GB201901291D0/en
Publication of GB2578798A publication Critical patent/GB2578798A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2035—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • F24F11/35—Responding to malfunctions or emergencies to fire, excessive heat or smoke by closing air passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon

Abstract

An air treatment device 10 for treating and recirculating extracted kitchen air, comprises an inlet 11 for receiving contaminated air extracted from a kitchen; a variable speed fan 17 for drawing air through the air treatment device; an electronic control unit arranged to control the speed of the fan; a multistage filtration system 15 for treating the contaminated air; an outlet 19 for exhausting the filtered air back into the kitchen or another space; and, an automatic fire protection system 13 including a damper 131 for fire and smoke, and a fire extinguishing means 133. The damper may include a motor to open and close the damper. The system may use pressure transducers connected to the electronic control unit to monitor a pressure drop across the filtration system to determine the condition of the filters. A ventilation system using said air treatment device, a canopy above a source of contaminated air, a duct connecting the canopy inlet to the treatment device and a biocide treatment system for treating contaminant residue is also claimed.

Description

AIR TREATMENT DEVICE AND VENTILATION SYSTEM
The present invention relates generally to an air treatment device and ventilation system. More particularly, the invention relates to an air treatment device for treating and recirculating extracted kitchen air with improved fire safety, and a ventilation system for treating and recirculating extracted kitchen air with improved fire safety.
BACKGROUND TO THE INVENTION
In food preparation areas, particularly in a commercial environment such as a restaurant kitchen, the ambient air is contaminated by various cooking appliances and techniques These appliances, such as ovens, fryers, salamander grills, hobs and the like, introduce oil, grease, smoke and other particulate matter into the air. Additionally, the appliances and techniques used to cook food introduce significant heat to a kitchen causing the temperature of the ambient air to be raised Traditionally, heated and contaminated air has been removed using an extractor sitting above, or in close proximity to, the appliance to draw the ambient air through ducting and filters to an external location, these are commonly known as hood extractors or canopy extractors.
However, the air discharged from traditional systems may still contain various contaminants and as such must be exhausted to the atmosphere. Ventilation systems which clean the contamination from the air and reuse the otherwise wasted heat to heat a room in a building have been developed. These systems further provide a means to cool the clean air, however, they are unable to use the waste heat in a process other than directly heating a room with recirculated air.
A further problem within commercial food preparation areas is that of fires, with many instances being reported which caused substantial damage to property. Many of the fires are attributable to the build-up of fat and grease within the filters or ducting, causing the ventilation to work less efficiently and as such increasing the ambient temperature of the kitchen until ignition of contaminates. Cleaning and maintenance of the filters and ducts should be done on a regular basis; however, these tasks may not be given the priority needed which results in the tasks being forgotten or performed inappropriately increasing the risk of fire The need to keep ducting clean is even more important in a system which recirculates the filtered air around a building It is an object of the present invention to reduce or substantially obviate the aforementioned problems.
STATEMENT OF INVENTION
According to the first aspect of the present invention there is provided an air treatment device for treating and recirculating extracted kitchen air comprising: an inlet for receiving contaminated air extracted from a kitchen; a variable speed fan for drawing air through the air treatment device; an electronic control unit arranged to control the speed of the fan; a multistage filtration system for treating the contaminated air; an outlet for exhausting the filtered air back into the kitchen or another space; and, an automatic fire protection system including a damper for preventing or stifling fire and smoke, and a fire extinguishing means.
The air treatment device improves fire safety through the use of an automated fire protection system whilst being able to clean and recirculate air extracted from a kitchen. This allows commercial kitchen to be established in internal building spaces, which to date have been inaccessible for such use.
The damper of the automated fire protection system may be actuated from an open position to a closed position in response to a thermally responsive element. The use of a thermally responsive element may allow the damper to close should there be a temperature approaching a contaminate ignition point or an actual fire.
The thermally responsive element may comprise a temperature probe for detecting the temperature of the contaminated air before the treatment device inlet. This ensures that the system can monitor the temperature of the air entering the treatment device and close the damper to prevent high temperature air reaching the filters.
The thermally responsive element may be a thermal fuse comprising: a temperature probe for measuring temperature of the contaminated air before the treatment device inlet; and, a replaceable fuse which when tripped may cause the electrical supply to a damper actuation device to be cut off and a biasing element, such as a spring, to bias the damper to a closed position.
The damper may comprise: a motor for opening or closing the damper; and, a biasing element which biases the damper to a closed position should the motor fail because there is no electrical supply. This ensures that the fire protection system is automated and has a fast reaction time.
The automated fire protection system may include a further damper to help prevent or stifle fires and smoke. The dampers may be located at both the inlet of the treatment device and the outlet of the treatment device The additional damper assists in minimising any potential air flow and thus assists in preventing or stifling fire and or smoke.
The air treatment device may have a housing which encloses some of the features set out above; for example, it may enclose the variable speed fan, multistage filtration system and automatic fire protection system. However, parts of the automatic fire protection system may be located outside of the housing. The housing may be constructed from a number of interlinked panels sealed together with intumescent sealant. The panels may be double skinned, where each skin layer is made from steel and a non-combustible insulator. A housing provides protection to the internal components; furthermore, the structural integrity of the air treatment device can be maintained for longer in the presence of a hydrocarbon fire, because of the particular construction.
At least one stage of the multistage filtration system may be a grease filter, a pleated panel filter, a rigid filter, or may comprise activated carbon. In isolation or combination, these stages allow for various contaminates to be removed from the extracted air, with a combination of filters providing a better level of filtration. For example, each filter stage may filter out different sizes of contaminate. By providing multiple stages it is possible to filter the majority of contaminates from the extracted air. The filter stages may comprise disposable filters made from a suitable filter material, and frames to hold the filter sheets. The filter sheets may be removed and replaced once it has captured enough contaminates to deteriorate the flow of air or become a significant risk.
The air treatment device may further comprise a heat recovery system, such as a coil, to extract heat from the received air before exhausting through the outlet. The heat recovery system allows for the filtered air to be used in a number of environments as the temperature can be lowered, while recovering the wasted heat to be used in other processes, such as heating water.
The electronic control unit may be connected to a number of sensors for monitoring various parameters of the treatment device, for example the pressure may be measured, using pressure transducers, so as to determine a pressure drop. This pressure drop is indicative of the condition of various components of the device including the variable speed fan, and the multistage filtration system. The control unit may determine the pressure drop across the whole multistage filtration system, or each stage of the multistage filtration system. This allows for either the general condition of the multistage filtration system or the condition of each filter stage to be determined.
The electronic control unit may also monitor the pressure across the variable speed fan. The monitoring of pressure ensures that various components, such as filter stages, are replaced when there is a sufficient loss in efficiency. The electronic control unit may adjust the speed of the fan based on the determine pressure drops, or the measured pressure within the device. This ensures that an appropriate fan speed is chosen so that the life of the variable speed fan can be extended, and the power consumption may be optimised.
According to a second aspect of the present invention, there is provided a ventilation system for treating and recirculating extracted kitchen air, comprising: a ventilation treatment device according to the first aspect of the invention; at least one canopy located above a source of contaminated air; a series of ducts connecting the canopy to the inlet of the ventilation treatment device, and at least one biocide treatment system for dispensing a biocide treatment to treat contaminate residue within the ventilation system.
The use of the biocide sprayer helps break down contaminate residue, particularly, fat and grease, located in the ducting between the canopy and treatment device, improving fire safety throughout a portion of a ventilation system. This allows the time between cleaning and maintenance to be extended.
The biocide treatment system may comprise a spraying device for dispensing a biocide treatment and a treatment reservoir for storing the biocide treatment. The spraying device allows for the biocide to be dispensed into the airflow of the extracted air so that it can pass through the ventilation system and encounter contaminate residue.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made by way of example only to the accompanying drawings, in which.
Figure 1 shows a first schematic view of an exemplar embodiment of an air treatment device according to the first aspect of the present invention; Figure 2 shows a second schematic view of the embodiment of the air treatment device shown in figure 1; and Figure 3 shows a schematic view of a ventilation system according to a second aspect of the invention.
DESCRIPTION OF PREFERRED EMBODIMENT(S)
Figures 1 and 2 show a ventilation treatment device 10 comprising an inlet 11; an automatic fire protection system 13; a multistage filtration system 15; a variable speed fan 17; an electronic control unit (not shown) adapted to control the speed of the fan; and an outlet 19. The inlet 11 may be connected to ducting from a kitchen ventilation system so that contaminated air can be drawn into the treatment device when the variable speed fan 17 is operated. The outlet 19 may be connected to further ducting leading to the same room as the treatment device, another room in the same building, or the outside. Air is being recirculated when it remains within the same building. For example, air is being recirculated when the treatment device 10 exhausts the treated air, either directly or indirectly, into the same room as the treatment device or another room within the same building.
The inlet 11 and outlet 19 may be sized and shaped to correspond with various sizes and shapes of ducting known to the skilled person. Contaminated air from a kitchen is drawn through the inlet 11, by the variable speed fan 17, into the air treatment device 10 for treatment by the multistage filtration system 15 before being exhausted through the outlet 19. The multistage filtration system removes contamination from the extracted air, which allows filtered air to be used within an area of a building separate to that of the kitchen.
The automatic fire protection system 13, the multistage filtration system 15, and the variable speed fan 17 are enclosed within a housing 2L The housing 21 is constructed from a plurality of double skin bonded panels (not explicitly shown in the figures), made from stainless steel, which are inter-locked and sealed together by an intumescent sealant. The outer skin may be constructed from a 20 gauge coated zintex sheet steel and the inner skin may be 20 gauge austenitic stainless steel type 316 sheet The inner skin and outer skin may be formed into trays and bonded to non-combustible rockwool board insulation having a rating of Euroclass Al and conforms to EN 13162.
As the air treatment system is used, the multistage filtration system collects contaminates, typically fats and grease, which are ignitable The automatic fire protection system 13 is intended to prevent fires and/or extinguish a fire.
The automatic fire protection system 13 includes dampers which are adapted to prevent or stifle fire or smoke by blocking or hindering the flow of air through the air treatment system 10. The automatic fire protection system 13 protects the treatment device by actuating a component, such as the damper 131 or extinguisher 133, in response to an input, from a sensor, which represents an increased possibility of ignition or the presents of a fire. For example, the system may actuate the damper, or extinguisher, through an actuation means if the system determines the internal temperature of the treatment device is indicative of a fire, or represents a risk of ignition. The treatment device includes a damper 131 located at the inlet 11 and a further damper 135 located at the outlet 19. Both dampers 131 and 135 are mechanical type dampers which use moveable interior blades or baffles to prevent the flow of air through the treatment device 10. Both mechanical dampers 131 and 135 include an electric motor (not shown in the figures) which controls the moveable interior blades or baffles (not shown in the figures).
To prevent or stifle a fire, the dampers are actuated from an open position to a closed position in response to a thermally responsive element (not shown in the figures). The thermally responsive element may be a temperature probe (not shown in the figures) which responds to an increase in temperature. The temperature probe is located in the ducting between the kitchen and the treatment device so that it can determine if the temperature of the contaminated air is approaching a contaminate ignition point. The probe may be connected to a thermal fuse (not shown) which trips when there is a temperature indicative of a fire or an ignition point, this causes the electrical supply to the dampers 131 and 135 to be cut. Once there is no electrical supply, a biasing element (not shown), such as a spring, biases the damper into a closed position preventing the flow of air through the system.
The automatic fire protection system further comprises a fire extinguisher 133. The fire extinguisher can be charged with various fire retardants, known to the skilled person, which would be suitable to extinguish at least a hydrocarbon fire. The fire extinguisher may automatically dispense the fire retardant when there is a fire within the air treatment device Each stage of the multistage filtration system 15 is used in series to remove the contaminates from the extracted air, with each stage preferably increasing the level of filtration. The first stage filter 151 is a pre-filter or grease filter, which may be made from a synthetic filter medium rated at class G2 for EN779:2012. The second stage filter 153 is a pleated panel filter. The third stage filter 155 is a rigid activated carbon filter with a filter medium of class F7 to EN779:2012 and ePM1 70% to 1S018890. While this example provides three stages to the multilayer filter it should be understood that there is no limitation to solely three layers. Furthermore, the type of filters described are preferential, but the skilled person would understand and recognise that there are a variety of filter types, filter mediums, and filter classes which are appropriate for various environments in which the air treatment device could be located. The multistage filtration system is accessible through an access panel 25 in the housing 21 which allows for the panels to be replaced.
An electronic control unit (not shown) is located on or in the treatment device 10 and controls the operation of the variable speed fan 17. The electronic control unit may be connected to sensors (not shown), such as pressure transducers, which are located in position suitable for monitoring the pressure drop across the multistage filtration system and/or the variable speed fan. By monitoring pressure drop it is possible to monitor the condition, or level of clogging, of the filter.
The air treatment device 10 includes a heat recovery system 29 to extract waste heat from the received air before it is exhausted through the outlet. The heat recovery system may be a heat recovery coil or a heat pump.
Figure 3 shows a ventilation system 30 comprising: an air treatment device 10, at least one canopy 32 connected by ducting 34 to the air treatment device 10, and at least one biocide treatment system 36. An air treatment device 10 according to the embodiments of the invention described above and shown in figures 1 and 2 is used within the ventilation system 30 The at least one canopy 32 is located in a kitchen above a cooking area and serves as an inlet to the ventilation system. The variable speed fan 17 draws contaminated air into the air treatment device 10 from the kitchen through the at least canopy 32 and the ducting 34. This contaminated air is treated by the multistage filtration system 15 and then expelled through the outlet 19 into further ducting.
Contaminate residue is deposited in the at least one canopy 32 and ducting 34 as the contaminated air is drawn into the air treatment device 10. The biocide treatment system 38 serves to break down the residue by dispensing a biocide treatment into the airflow. The biocide treatment is stored in a biocide treatment reservoir (not shown) which feeds a spraying device (not shown). The spraying device dispenses the biocide into the contaminated air flow. The spraying device can be located in the canopy or another position which is suitable to dispense the treatment into the airflow. Similar to the contaminate residue, a portion of biocide treatment will be deposited in the at least one canopy and ducting and start reacting with the contaminate residue.
By using the first aspect of the invention, it is possible to improve fire safety within ventilation systems, particularly air treatment devices for use within such systems. This allows for commercial kitchens to be established in wider variety of locations, previously inaccessible for various reasons such as regulations. Furthermore, the automatic fire protection system increases fire safety by closing off air flow into the air treatment device should the temperature of extracted air be close to an ignition point or in the presence of a fire.
The second aspect of the invention improves fire safety within a ventilation system, by removing another ignition source within the system. By dispensing a biocide into the system, it is possible to more easily treat and remove the oil, fat and grease residue from the system. Furthermore, as it uses the treatment device of the first aspect of the invention it has all the same advantages.
The embodiments described above are provided by way of example only, and various changes and modifications will be apparent to persons skilled in the art without departing from the scope of the present invention as defined by the appended claims

Claims (6)

  1. CLAIMS1 An air treatment device for treating and recirculating extracted kitchen air, comprising: an inlet for receiving contaminated air extracted from a kitchen; a variable speed fan for drawing air through the air treatment device; an electronic control unit arranged to control the speed of the fan; a multistage filtration system for treating the contaminated air; an outlet for exhausting the filtered air back into the kitchen or another space; and, an automatic fire protection system including a damper for fire and smoke, and a fire extinguishing means.
  2. 2. An air treatment device as claimed in claim I, wherein the damper is actuated from an open position to a closed position in response to a thermally responsive element.
  3. 3 An air treatment device as claimed in claim 2, wherein the thermally responsive element comprises a temperature probe for detecting the temperature of the contaminated air before the inlet to the air treatment device.
  4. 4. An air treatment device as claimed in claim 3, wherein the damper comprises a motor for opening or closing the damper, and a biasing element to bias the damper to a closed position, wherein the temperature probe has a thermal fuse which is adapted to shut off an electrical supply to the motor causing the biasing element to close the damper.
  5. An air treatment device as claimed in any of claims 1 to 4, wherein the automatic fire protection system comprises a further damper, the first damper being located at the inlet of the air treatment device and the second damper located at the outlet of the air treatment device.
  6. 6. An air treatment device as claimed in any preceding claim, fiirther comprising a housing to house the variable speed fan, multistage filtration system and automatic fire protection system 7. An air treatment device as claimed in claim 6, wherein the housing is constructed from a plurality of double-skin bonded panels, interlinked and sealed with intumescent sealant.8 An air treatment device as claimed in claim 7, wherein each skin layer of the double skin bonded panels comprises a non-combustible insulation material and steel sheet.9. An air treatment device as claimed in any preceding claim, fiirther comprising a heat recovery system to extract waste heat from the received air before exhausting through the outlet An air treatment device as claimed in any preceding claim, wherein the multistage filtration system includes a series of filter stages, each filter stage removing various particulates.11. An air treatment device as claimed in any preceding claim, wherein at least one stage of the multistage filtration system is a grease filter made from a synthetic medium 12. An air treatment device as claimed in any preceding claim, wherein at least one stage of the multistage filtration system is a pleated panel filter.13. An air treatment device as claimed in any preceding claim, wherein at least one stage of the multistage filtration system is a rigid filter.14. An air treatment device as claimed in any preceding claim, wherein at least one stage of the multistage filtration system comprises activated carbon.An air treatment device as claimed in any preceding claim, wherein the electronic control unit, through pressure transducers, monitor pressure drop across the multistage filtration system to determine the condition of the multistage filtration system.16. An air treatment device as claimed in claim 15, wherein the electronic control unit monitors pressure drop across each individual stage of the multistage filtration system to determine the condition of each individual stage of the multistage filtration system.17 An air treatment device as claimed in claim 15 or 16, wherein the electronic control unit monitors the variable speed fan through a pressure transducer.18. An air treatment device as claimed in any of claims 15 to 17, wherein the speed of the fan is adjusted based on the monitored values from pressure transducers 19. A ventilation system for treating and recirculating extracted kitchen air, comprising: an air treatment device as claimed in any preceding claim; at least one canopy located above sources of contaminated air: at least one duct connecting the canopy to the inlet of the air treatment device; and, at least one biocide treatment system for dispensing a biocide treatment to treat contaminate residue within the ventilation system.20. A ventilation system as claimed in claim 19 wherein the biocide treatment system comprises a spraying device suitable for dispensing a biocide treatment and a treatment reservoir for storing the biocide treatment.21. A ventilation system as claimed in claim 18 or 19, in which the system further comprises a collection tray for collecting the biocide treatment, broken down contaminates and free particulates.
GB1901291.3A 2019-01-30 2019-01-30 Air treatment device and ventilation system Active GB2578798B (en)

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GB1901291.3A GB2578798B (en) 2019-01-30 2019-01-30 Air treatment device and ventilation system

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GB201901291D0 GB201901291D0 (en) 2019-03-20
GB2578798A true GB2578798A (en) 2020-05-27
GB2578798B GB2578798B (en) 2021-02-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785124A (en) * 1971-08-02 1974-01-15 Gaylord Ind Pollution-free kitchen ventilator
GB2296322A (en) * 1994-12-22 1996-06-26 Garland Commercial Ranges Ltd Exhaust assembly for a cooking appliance
KR20160134993A (en) * 2015-05-14 2016-11-24 김부열 A device for fume removal contained hood having function of flame to be flowed

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785124A (en) * 1971-08-02 1974-01-15 Gaylord Ind Pollution-free kitchen ventilator
GB2296322A (en) * 1994-12-22 1996-06-26 Garland Commercial Ranges Ltd Exhaust assembly for a cooking appliance
KR20160134993A (en) * 2015-05-14 2016-11-24 김부열 A device for fume removal contained hood having function of flame to be flowed

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GB2578798B (en) 2021-02-24
GB201901291D0 (en) 2019-03-20

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