Extractor hood with filter system

Description

[0001] The present invention relates to a cooker hood with a filter system.

[0002] The extractor fan is also referred to as a range hood in the following. Extractor fans, such as range hoods mounted above a cooktop or downdraft extractors mounted in or next to the cooktop, are used in kitchens and are known to operate as either ducted or recirculating extractor fans, or to be designed as recirculating extractor fans. In particular, extractor fans designed or capable of operating as recirculating extractor fans must filter out not only particles such as oil droplets, but also cooking odors and, in particular, volatile organic compounds (VOCs) from the cooking fumes.

[0003] Recirculating air filters that use activated carbon to remove odor molecules from cooking fumes are already established on the market. Another technical solution is odor reduction through plasma / ozone treatment. This primarily involves placing an additional module directly on the exhaust vent of a range hood or connecting it to a range hood via ductwork in close proximity.

[0004] JP2005299999A describes a movable, assembled kitchen appliance body equipped with a cooking stove and a blower for drawing in oily smoke produced during cooking.A high-temperature dust collection filter, located near the cooking range, primarily to remove oil content from the collected oily smoke; a deodorizing device, located downstream of the high-temperature dust collection filter, primarily to remove odors from the oily smoke after it has passed through the filter; an electric dust separator, located downstream of the deodorizing device, primarily to remove oil content and odors from particles in the oily smoke that has passed through the deodorizing device; and an exhaust opening, provided in the kitchen appliance body, to expel the oily smoke from the electric dust separator of the appliance body via the fan.

[0005] DE2412588A1 discloses a cooker hood equipped with a mechanical pre-filter in the airflow that separates larger dirt particles, etc. Downstream of this, in the airflow, is an electric filter. However, it is possible to install a conventional activated carbon filter between the two filters. The electric filter thus captures the smallest dirt particles and can be easily cleaned in a bowl or dishwasher.

[0006] US20100282594A1 describes a method for cleaning a hot air stream, wherein the air stream is passed through a cooling device and subsequently through a filter device comprising at least one plasma generation device for removing gaseous organic carbon compounds. The cooling device cools the hot air stream to temperatures below 60 °C. The air stream to be cleaned is accelerated before entering the filter device and deflected by suitable guide surfaces. A hot air stream cleaning device is provided, comprising a filter device with a plasma generation device for removing gaseous organic carbon compounds and a cooling device upstream of the filter device. The cooling device includes a spray device for a coolant.The filter device consists of an open-pored hydrophilic foam material, the plasma generation device and a suitable absorber material, which are successively passed through by the airflow.

[0007] WO2020163443A1 describes a cooking fume reduction system that may include a range hood configured to capture fumes from a cooking appliance. The range hood then directs the fumes to a particle removal stage, which in turn directs them to an odor removal stage. The system may also include an inlet sensor for volatile organic compounds (VOCs) upstream of the odor removal stage and an outlet VOC sensor downstream of the odor removal stage. The odor removal stage may include a carbon filter or a UV light source. The particle removal stage may include a bag filter or an electrostatic precipitator. The system may also include a controller that receives signals from the inlet and outlet VOC sensors and uses these signals to generate data indicating the remaining service life of the carbon filter.

[0008] A heating kettle is described in JP2010071615A.

[0009] To improve the filter performance of a recirculating range hood, improving particle filtration is also crucial. Concepts for particle filtration using electrostatic filters in range hoods are already established. Typically, filtration takes place directly in the hood's intake area. Additionally, in a range hood operating in exhaust mode, the electrostatic filter can be installed on a public exhaust duct in larger apartment buildings, further filtering the cooking fumes.

[0010] The object of the present invention is to create a solution that can achieve high filter performance and can be designed flexibly.

[0011] According to the invention, this problem is solved by a fume hood with the features according to claim 1. Embodiments of the fume hood are specified in the dependent claims and the description.

[0012] The invention therefore relates to a fume extraction device comprising a fan and a filter system, wherein the filter system comprises a coarse filter and an odor filter downstream of the coarse filter, wherein the coarse filter and the odor filter are arranged upstream of the fan in the direction of flow and the filter system further comprises a fine filter arranged downstream of the fan in the direction of flow.The extractor hood is characterized in that at least the odor filter and / or the fine filter is an active filter, wherein the filter system comprises a control unit which is connected to the at least one active odor filter and / or the active fine filter and optionally to the fan, and wherein the filter system comprises at least one odor sensor which is connected to the control unit at least for transmitting measurement data, and a bypass channel is formed between an edge of the odor filter and a housing of the extractor hood in which the odor filter is held, and the odor sensor is arranged in the bypass channel.

[0013] The extraction device can be a range hood or a downdraft extractor. A range hood is defined here as an extraction device positioned above a cooktop or worktop that draws air upwards. A downdraft extractor is defined as an extraction device positioned in or next to a cooktop that draws air downwards. The extraction device is preferably used in a kitchen.

[0014] According to the invention, the extractor hood comprises a fan and a filter system. The fan can be arranged in an extractor housing of the extractor hood. The air to be cleaned is drawn into the extractor hood by the fan through an extraction opening, which can also be referred to as an intake opening. The extraction opening can be formed in the extractor housing of the extractor hood. In the case of a range hood, the extraction opening can optionally be provided in a cover or a vapor screen connected to the extractor housing. In this case, an inlet opening is provided in the extractor housing through which air that has passed through an extraction opening in the cover can enter the extractor housing. It is also possible that a baffle plate is provided at the extraction opening, which covers at least part of the extraction opening.In this case, an extraction gap is formed between the extraction opening and the baffle plate, which can, for example, be a circumferential slot or a slot along one edge of the baffle plate. In these cases, the extractor hood can also be referred to as a perimeter extraction hood.

[0015] In a downdraft extractor, the fan is usually located below an extraction opening that is provided in or adjacent to a cooktop.

[0016] According to the invention, the extractor hood comprises a filter system. The filter system includes several filters. The filters can also be referred to as filter modules. Each filter can consist of one or more filter elements. Furthermore, at least two filters can be combined in a single unit. A unit, in this context, refers to a structural unit that can be attached as a single unit to or within the extractor hood, for example, the extractor hood housing, and preferably removed again when necessary. Preferably, the filter system comprises at least two filter modules. The at least two filter modules are preferably provided separately within the extractor hood, particularly within or within the extractor hood housing. In addition to the filters, the filter system can also include other components, such as a control unit.

[0017] The filter system comprises a coarse filter and an odor filter. According to the invention, "filter system" refers to the combination of at least these two filters. However, the system preferably does not constitute a single structural unit and may, in addition to filters, include further components, in particular sensors and / or a control unit.

[0018] A coarse filter is a filter that removes particles from the intake air. A coarse particle filter is preferably a filter where particle separation occurs through mechanical processes. In particular, particle separation can occur due to the geometry of the filter material. A coarse filter can therefore be, for example, a baffle filter or an expanded metal filter. In a baffle filter, separation occurs due to turbulence generated by the geometry of one or, preferably, several filter elements as air flows through them. The expanded metal filter can consist of one or more layers of expanded metal, optionally held within a frame.The coarse filter preferably separates particles, such as grease or oil droplets, with a diameter greater than 2 µm. The coarse filter is preferably located in or near the extraction opening of the extractor hood, particularly the inlet opening of the hood housing. This prevents particles, especially larger particles, from entering the interior of the extractor hood, particularly the hood housing, and thus prevents contamination of the components located inside the extractor hood, such as the fan.

[0019] The odor filter, which according to the invention is part of the filter system, serves to remove odorous substances from the air pre-cleaned by the coarse filter. For this purpose, the odorous substances can be retained by the odor filter or at least partially decomposed by it. According to the invention, the odor filter can be an active filter or a passive filter. A passive odor filter is defined as a filter that, in its installed state in the exhaust system, filters odorous substances from the air flowing through it without any additional measures. For example, an activated carbon filter or a filter with other odor-adsorbing materials can be used as a passive filter. An active odor filter is defined as a filter in which odorous substances are affected by the application of energy. In particular, the energy can be provided as plasma energy or by UV radiation.According to one embodiment, the active odor filter is therefore a plasma filter or a UV filter, in particular a UV emitter.

[0020] According to the invention, the odor filter is located downstream of the coarse filter. "Downstream" here refers to an arrangement of the odor filter in the direction of flow after the coarse filter.

[0021] The direction of flow is defined as the direction in which the air drawn in by the extractor fan, in particular the fan, flows through the extractor fan.

[0022] The coarse filter can be a separate module from the odor filter or be combined with it in a single module.

[0023] According to the invention, the coarse filter and the odor filter are arranged upstream of the fan in the direction of airflow. This means that the air in the extractor fan only flows through the fan after it has passed through the coarse filter and the odor filter.

[0024] Furthermore, according to the invention, the filter system includes a fine filter arranged downstream of the fan in the direction of airflow. A fine filter is defined as a particle filter. The fine filter is specifically designed to filter out particles with a small particle size, for example, with a diameter of less than 2 µm. The fine filter can optionally be either an active or a passive filter. A passive fine filter is defined here as a filter that, in its installed state in the exhaust system, filters out fine particles from the air flowing through it without any additional measures. For example, a fine-mesh mechanical filter, particularly a fine-mesh inertial filter, can be used as a passive filter. The passive fine filter can therefore, for example, be an expanded metal filter with a small mesh size.An active fine filter is a filter in which fine particles are filtered out by the application of energy. In particular, the fine filter can be an electrostatic filter in which the particles are charged by ionization and subsequently deposited on surfaces, especially deposition electrodes, that are charged. The deposition can be supported by the field generated between preferably differently charged deposition electrodes and by the charge of the particles.

[0025] According to the invention, the fine filter is arranged downstream of the fan in the direction of airflow. This allows the air leaving the extractor hood, and in particular the extractor housing, to be freed from fine particles during the preferred operation of the extractor hood in recirculation mode, thus preventing contamination of the environment in which the extractor hood is operated, especially the kitchen.

[0026] The present invention improves the air purification of cooking fumes in the recirculation mode of a range hood. The inventive arrangement and the use of the described technologies of the individual filters generate high filtration performance. Furthermore, since the filters can be provided as individual modules or, if desired, partially combined modules, the modular design allows for a flexible combination of filter technologies and the resulting purification performance.

[0027] According to the invention, at least the odor filter and / or the fine filter is an active filter. Preferably, both the odor filter and the fine filter are designed as active filters. Alternatively, either the odor filter or the fine filter can be designed as an active filter. The advantage of using an active filter is that it can be easily adapted to the current ambient and / or operating conditions of the exhaust system.

[0028] According to the invention, the filter system comprises at least one odor sensor. The at least one odor sensor is preferably located inside the exhaust hood and particularly preferably in the area of ​​the odor filter. An odor sensor is defined in particular as a sensor that allows for a quantitative and, optionally, a qualitative analysis of the air. The odor sensor can preferably be a VOC sensor (volatile organic compounds).

[0029] By incorporating an odor sensor, the effectiveness of the filter system, and in particular the filter efficiency of the filters, can be assessed. Additionally or alternatively, the active filter(s) of the filter system can be controlled based on the sensor data (also known as measurement data) obtained from the odor sensor. This allows for improved filter efficiency.

[0030] The filter system includes a control unit connected to at least one active odor filter and / or the active fine filter, and optionally to the fan. The control unit can be combined with or integrated into the motor control of the extractor hood. Controlling an active filter refers specifically to setting the operating parameters of that filter. Thus, for example, supplying power to the active filter(s) can be described as controlling the active filter(s).

[0031] The odor sensor is connected to the control unit, at least for the purpose of transmitting measurement data. The measurement data acquired by the odor sensor can be evaluated within the sensor itself, and the evaluation result can be transmitted to the control unit instead of the raw measurement data. Alternatively, the raw measurement data from the odor sensor can be transmitted to the control unit for evaluation. Based on the measurement data or the evaluation result, control signals for the active filter(s) can be generated in the control unit. In addition to the measurement data or the evaluation results, the operating status of the fan can also be taken into account. Furthermore, it is also within the scope of the invention for the control unit to be additionally connected to other data sources, such as other networked measuring stations or other household appliances. According to one embodiment, the odor sensor is arranged adjacent to the odor filter.The position of the odor sensor relative to the odor filter is described as "adjacent" when the distance to the odor filter is small. This arrangement makes the data recorded by the odor sensor particularly reliable for the substances actually filtered out by the odor filter.

[0032] According to one embodiment, the odor sensor lies in the plane of the odor filter. The plane of the odor filter is defined as the plane in which the odor filter extends perpendicular to the flow direction. Furthermore, an odor sensor arranged in the plane of the odor filter is defined as one that preferably extends neither in nor against the flow direction beyond the odor filter.

[0033] The odor sensor, which is arranged in the plane of the odor filter, can be located within the surface of the odor filter or adjacent to an edge of the odor filter. If the odor sensor is arranged in the plane of the surface of the odor filter, it can, for example, be embedded in the surface, particularly in a depression in the surface, of the odor filter, which represents the upstream side of the odor filter, that is, the side of the odor filter that is reached first by the oncoming airflow.

[0034] According to the invention, a bypass channel is formed between an edge of the odor filter and a housing of the exhaust system in which the odor filter is held, and the odor sensor is arranged in the bypass channel. A bypass channel is defined as a region that lies in the plane of the odor filter and in which no filter material of the odor filter is present. The bypass channel can be formed by a gap between the edge of the odor filter and the housing of the exhaust system in which it is held. The air flowing through the bypass channel can also be referred to as the measuring airflow. With this arrangement, no structural modification of the odor filter is required, apart from a possible reduction in the length or width of the odor filter, which creates a gap between the odor filter and the housing.

[0035] According to a non-inventive embodiment, the odor sensor is positioned upstream of the odor filter in the direction of airflow. This allows the air flowing through the exhaust system to be measured by the odor sensor with regard to the particles and / or species it contains before these are filtered out by the odor filter. This allows the requirements for the odor filter and / or the fine filter to be adjusted accordingly.

[0036] According to one embodiment, the active odor filter is a plasma filter or a UV filter. A plasma filter is defined as a filter in which odorants are at least partially neutralized or decomposed by plasma generated within the filter. The plasma can be generated by applying a high voltage.

[0037] According to one embodiment, the active fine filter is an electrostatic filter unit. An electrostatic filter unit is defined as a filter in which particles are ionized in an ionization stage and the ionized particles are subsequently separated in a separation stage. Ionization and / or separation can be achieved by applying a high voltage.

[0038] According to one embodiment, the extraction device is a range hood. In another embodiment, the fine filter is integrated into the range hood. In an alternative embodiment, the fine filter is connected to the range hood. In particular, the fine filter can be provided as a module attached to an outlet of the range hood, especially of a range hood housing or the fan, i.e., mounted on it.

[0039] The present invention improves the air purification of cooking fumes in the recirculation mode of a range hood. The inventive arrangement and the use of the described technologies (in particular mechanical filters, plasma filters, and electrostatic filters) achieve high filtration performance. The modular design of the invention also allows for flexible combination of the technologies and the resulting purification performance. The operating state / working range is optimally regulated / controlled by sensor-based data, thus ensuring optimal utilization of the technologies.

[0040] The invention is described in more detail below with reference to the accompanying figures. These show: Figure 1 : a schematic perspective view of an embodiment of a cooker hood; Figure 2: a schematic perspective sectional view of a non-inventive embodiment of a cooker hood; and Figure 3 : a schematic sectional view of an embodiment of a fume extraction device according to the invention in the area of ​​the odor filter.

[0041] Identical elements or components of the extractor hood are marked with the same reference symbols in the figures and are described only once, if necessary.

[0042] In Figure 1Figure 1 shows a schematic view of an embodiment of a range hood 1. In the embodiment shown, the range hood 1 comprises a housing 10. The range hood 1 also has a viewing hood 11, which in the embodiment shown is arranged on the front of the housing 10 and is an inclined viewing hood 11. In the embodiment shown, the viewing hood 11 consists of a frame-shaped vapor screen 110 and a baffle plate 111 provided in an opening of the vapor screen 110. An extraction gap 112 is formed between the vapor screen 110 and the baffle plate 111. Air is drawn into the range hood 1, and in particular into the housing 10, through at least part of the extraction gap 112. The range hood 1 is arranged above a cooktop K.

[0043] In Figure 2Figure 1 shows a schematic sectional view of a non-inventive embodiment of the extractor hood 1. In this embodiment as well, the extractor hood 1 is a range hood. The range hood has the following features: Figure 1 The structure shown and described is based on this.

[0044] An inlet opening 100 is formed in the front of the extractor hood housing 10, through which air enters via the hood 11, for example via the extraction gap formed therein (in Figure 2(not shown) can enter the extractor hood housing 10. A coarse filter 2 is arranged in the inlet opening 100, completely covering the inlet opening 100. The coarse filter 2 can be, for example, a baffle filter or a metal insert filter. Downstream of the coarse filter 2, in the direction of flow S, an odor filter 3 is arranged. The odor filter 3 lies parallel to the coarse filter 2 and, in the illustrated embodiment, has the same size, i.e., covers an area corresponding to the inlet opening 100. The odor filter 3 is preferably a plasma filter.

[0045] The fan 12 of the extractor hood is arranged in the extractor hood housing 10. The fan 12 is located downstream of the odor filter 3 in the direction of airflow S. A control unit 6, for example in an electrical box, is also provided in the extractor hood housing 12. In the illustrated embodiment, the control unit 6 is located above the fan 12. However, the control unit 6 can also be located elsewhere in the extractor hood housing 10. According to the invention, the control unit 6 can be used to control the fan 12. Preferably, the control unit 6 also serves, at least, to control the odor filter 3.

[0046] A fine filter 4 is provided on the top of the extractor hood housing 10. In the illustrated embodiment, the fine filter 4 is mounted on the extractor hood housing 10. In this case, the fine filter 4 is specifically mounted on an outlet nozzle (not shown) of the fan 12 and / or the extractor hood housing 10. However, it is also within the scope of the invention for the fine filter 4 to be integrated within the extractor hood housing 10. The air flowing through the extractor hood housing 10 therefore passes through the fine filter 4 upon exiting the fan 12 or, at the latest, upon exiting the extractor hood housing 10. The arrangement of the fine filter 4 can therefore be described as an arrangement in the exhaust area of ​​the fan 12. The fine filter 4 is preferably an electrostatic filter.

[0047] In the illustrated embodiment, the filter system therefore comprises a coarse filter 2, an odor filter 3, and a fine filter 4. Additionally, the filter system includes an odor sensor 5. In the Figure 2 In the illustrated, non-inventive embodiment, the odor sensor 5 is arranged on the front of the odor filter 3, i.e., it is located between the odor filter 3 and the coarse filter 2. The odor sensor 5, the fine filter 4 (which is an electrostatic filter), and the odor filter 3 (which is a plasma filter) are connected to the control unit 6. Thus, the odor filter 3 and the fine filter 4 can be controlled based on the measurement data acquired by the odor sensor 5. In addition, the fan 12 can also be controlled by the control unit 6.

[0048] In Figure 3Another embodiment of the extractor hood 1 according to the invention is shown. In particular, the part of the extractor hood 1 in the area of ​​the coarse filter 2 and the odor filter 3 is shown. The further construction of the extractor hood 1 can be described in the embodiment shown. Figure 2 are equivalent to.

[0049] In the embodiment according to Figure 3 is in contrast to the embodiment according to Figure 2The odor sensor 5 is arranged in the plane of the odor filter 3. Specifically, a gap is formed between the edge of the inlet opening 100 and an edge of the odor filter 3, forming a bypass channel 50. To create the bypass channel 50, the length of the odor filter 3 can be less than the length of the inlet opening 100. The bypass channel 50 can also be referred to as the measuring channel. A portion of the air purified by the coarse filter 2 can flow through this bypass channel 50, bypassing the odor filter 3. This portion of the airflow can also be referred to as the measuring volume. As a result, the odor filter 2 is not affected by the odor sensor 5.

[0050] The functionality of the extractor fan and, in particular, the filter system, is described again in general terms below.

[0051] In the first step of the recirculation mode of the extractor hood, the contaminated cooking fumes are drawn into the extractor hood, which can also be referred to as the appliance, and passed through a first coarse pre-filter, for example, a baffle filter or an expanded metal filter. Here, primarily large particles, mainly oil droplets, are removed from the cooking fumes, so that particles with a diameter >2µm are separated in this filter stage.

[0052] The next stage of fume filtration serves to reduce odors. This can be achieved simply by using an odor filter with activated carbon or another adsorber, or by employing an active system such as a plasma filter or UV lamp. According to the invention, both filters (coarse filter and odor filter) are arranged on the intake side of the fan, meaning they are positioned upstream of the fan in the direction of airflow. The fan can also be referred to as a blower.

[0053] An odor sensor is integrated into the filter system. This odor sensor can also be called an air sensor or gas sensor. It is positioned so that the air measurement is taken without affecting the odor filter. Accordingly, a "measuring volume" is provided parallel to the odor filter, directing a small fraction of the fumes to the odor sensor for measurement. This results in a minimal airflow that is not filtered by the odor filter.

[0054] In the exhaust area of ​​the fan, there may be an additional filter for further reduction of the smallest particles and oil droplets. This filter is called a fine filter and can be an integral part of the exhaust system, which can also be referred to as a range hood. Alternatively, the fine filter can also be a separate unit that can be added to the exhaust system.

[0055] The cooking fumes, already treated by the coarse filter and odor filter, still contain very fine and small particles / oil droplets. To further improve the cleaning performance of the extractor hood, the fumes are cleaned by the fine filter, so that even particles smaller than, for example, <2 µm are removed from the cooking air to a significant extent. The downstream fine filter can consist of a fine-mesh inertial filter or an electrostatic filter unit.

[0056] The operation of all components of the extractor hood can be controlled by a control unit, also known as an electronic unit. This unit regulates, for example, the fan speed. For each operating stage, the operating parameters of the odor filter, particularly a plasma module, and the downstream fine filter, which is designed as an electrostatic filter, are optimally adjusted to the specific operating stage. Optionally, an air sensor transmits air properties / parameters to the electronic unit. Depending on defined limits for the air properties, the operating parameters of the fan, odor filter, and / or fine filter are controlled.

[0057] Another option is to adjust the operating parameters of the fan, odor filter, and / or fine filter using external data sources. This could be achieved, for example, through additional networked measuring stations or other household appliances, such as the operating levels of a connected cooktop.

[0058] The fine filter module can optionally be designed as a separate, modular unit. To allow for variable adaptation to the operating levels of the extractor hood, a data connection is preferably established between the fine filter module and the extractor hood, in particular the control unit of the extractor hood. In addition to a wired data connection, wireless communication between the extractor hood and the module is preferably implemented.

[0059] The present invention offers a number of advantages. In particular, the modular design, i.e., the combination of individual filters, which can also be referred to as filter modules, allows for a flexible combination of technologies and the resulting cleaning performance. Optionally, the operating state / working range is regulated / controlled by sensor-based data, thus ensuring optimal utilization of the technologies. The two-stage particle filtration, consisting of a coarse filter and a fine filter, improves the filter quality compared to existing devices, especially in the range of <2 µm particle diameter. The coarse filter significantly increases the operating time / service life until the fine filter needs to be changed / cleaned. Reference symbol list

[0060] 1 Extractor hood 10 Extractor housing 100 Inlet opening 11 Viewing hood 110 Vapor screen 111 Baffle plate 112 Extraction gap 12 Fan 2 Coarse filter 3 Odor filter 4 Fine filter 5 Gas sensor 50 Bypass channel 6 Control unit Cooktop flow direction

Claims

1. Vapour extraction apparatus, which comprises a fan (12) and a filter system, wherein the filter system comprises a coarse filter (2) and an odour filter (3) downstream of the coarse filter (2), wherein the coarse filter (2) and the odour filter (3) are arranged in front of the fan (12) in the flow direction and the filter system furthermore has a fine filter (4), which is arranged after the filter (12) in the flow direction, characterised in that at least the odour filter (3) and / or the fine filter (4) is an active filter, wherein the filter system comprises a control unit (6) which, in order to actuate the at least one active odour filter (3) and / or the active fine filter (4) and possibly in order to actuate the fan (12), is connected thereto, and wherein the filter system comprises at least one odour sensor (5), which is connected to the control unit (6) at least in order to transfer measurement data, and a bypass channel (50) is formed between an edge of the odour filter (3) and a housing (10) of the vapour extraction apparatus (1), in which the odour filter (3) is held, and the odour sensor (5) is arranged in the bypass channel (50).

2. Vapour extraction apparatus according to claim 1, wherein the odour sensor (5) is arranged adjacent to the odour filter (3).

3. Vapour extraction apparatus according to claim 2, wherein the odour sensor (5) lies in the plane of the odour filter (3).

4. Vapour extraction apparatus according to one of the preceding claims, wherein the active odour filter (3) represents a plasma filter or a UV filter.

5. Vapour extraction apparatus according to one of the preceding claims, wherein the active fine filter (4) represents an electrostatic filter unit.

6. Vapour extraction apparatus according to one of the preceding claims, wherein the vapour extraction apparatus (1) represents a vapour extraction hood and the fine filter (4) is integrated into the vapour extraction hood or is connected to the vapour extraction hood.