WO2014139537A1

WO2014139537A1 - A kitchen appliance

Info

Publication number: WO2014139537A1
Application number: PCT/DK2014/050059
Authority: WO
Inventors: Palle Madsen
Original assignee: M&L Company Aps
Priority date: 2013-03-14
Filing date: 2014-03-13
Publication date: 2014-09-18

Abstract

1. A kitchen appliance (100) for use with a built-in oven and for integration into a kitchen cabinet (2); said kitchen appliance comprises a box-shaped element (4) adapted to be built into a kitchen cabinet over a built-in oven; said box-shaped element comprises an inlet duct (6) and an outlet duct (8), said inlet duct and an outlet duct are connected so as to form a channel (10) within said box- shaped element; wherein said box- shaped element comprising opening means (12) or shifting the area at the inlet duct between an open and a closed state, thereby enabling removal of particles in air, and steam and smell of cooking.

Description

A kitchen appliance

Field of the invention

The present invention relates in a first aspect to a kitchen appliance for use with a built-in oven for the purpose of removal of particles in air, and steam and smell of cooking from an oven. In a second aspect the present invention relates to a system comprising such kitchen appliance.

Background of the invention In domestic kitchens it is well-known to have installed a so-called cooking hood above a stove in order to be able to remove steam, moist and smelling fumes originating from cooking on the stove. If not removed, such steam, moist and fumes may generate an annoying damp environment for the persons located in the kitchen and the surrounding space. Furthermore, any steam which is not removed may condense at relative cold surfaces, such as on the walls of the kitchen thus potentially representing a risk of mould growth in the kitchen.

In relation to use of ovens of the type which are built into a cabinet in the kitchen it will in many cases not be possible, by using a cooking hood arranged above a stove, to provide a sufficient removal of steam, moist and smelling fumes originating from food being cooked in the oven. A reason for this is that in many instances, such built-in ovens are not located underneath the cooking hood for the stove. Rather, the built-in ovens are usually arranged at another location in the kitchen.

Furthermore, based on experimental and epidemiologic studies, air quality experts have concluded that even short-term exposure to ultrafine particles (particles smaller than 100 nm) in air may have an adverse effect on humans. A study attempting to measure the particle number in air in 56 residential homes in

Copenhagen, Denmark and attempting to correlate peaks in the particle number count with activities of the persons living in the homes, concluded that cooking (including cooking in an oven) accounted for some of the peaks in the particle counts of the air inside the homes (Beko et al., Environ. Sci. Technol. 2013, 47, 10240 - 10248). In the prior art is disclosed a solution to the problem of removing steam, moist and smelling fumes originating from an oven. WO 2012/084600 discloses an oven which comprises a vapour extraction means. The vapour extraction means are adapted to suck moist air from the interior of the oven and to expel this moist air through a hose and lead the moist air away from the kitchen. However, as vapour extraction means of this invention are adapted to remove air from within the oven, also heat will be removed. Accordingly, this invention is not suitable for practical use when cooking food in an oven.

Accordingly, there remains a need for a device which is able to remove vapour, steam, moist, particles in air and smelling fumes when cooking food in an oven. It is on object of the present invention to provide a device which overcomes the disadvantages set out above.

Brief description of the invention

The object of the present invention may be achieved by a kitchen appliance having the features defined in claim 1, and by a system having the features defined in claim

20. Preferred embodiments are defined in the dependent claims and explained in the following description and illustrated in the accompanying drawings.

Accordingly, the present invention relates in a first aspect to a kitchen appliance for use with a built-in oven and for integration into a kitchen cabinet; said kitchen appliance comprises a box-shaped element adapted to be built into a kitchen cabinet over a built-in oven; said box- shaped element comprises an inlet duct and an outlet duct, said inlet duct and an outlet duct are connected so as to form a channel within said box- shaped element; wherein said box- shaped element comprising opening means for shifting the area at the inlet duct between an open and a closed state, thereby enabling removal of steam, particles in air and smell of cooking.

In a second aspect the present invention relates to a system comprising a kitchen appliance according to the first aspect of the present invention in combination with an external air suction pump and a hose; said air suction pump having an air inlet and an air outlet; and said hose being adapted to connect the inlet of said external air suction pump with the outlet duct of said kitchen appliance. The present invention provides the advantage that when cooking in an oven in a domestic kitchen, moist damages originating from the food being cooked in an oven may be avoided because the appliance and the system of the invention will be able to remove moist and steam originating from the oven cooked food before this moist condensates on various surfaces in the kitchen. Furthermore, the dispersion of smoke and smells and particles in air originating from the food to the kitchen and other rooms of the home may be considerably reduced.

Apart from securing a healthier environment in terms of removal of moist which may otherwise lead to mould growth in a kitchen or other parts of a building housing a kitchen, the present invention will also secure a healthier environment to per persons living or staying in the building housing the kitchen due to the fact that air the concentration of particles in the air originating from cooking food in an oven may be considerably reduced.

Brief description of the figures

Fig. 1 a is a plane side view of one embodiment the kitchen appliance according to the invention.

Fig. lb is a plane side view of the embodiment of the kitchen of fig. la.

Fig. 2 is a plane front view of another embodiment of the kitchen appliance according to the invention.

Fig. 3 is a perspective view of the embodiment of the kitchen appliance of fig. 2.

Fig. 4 is a perspective view of the kitchen appliance of fig. 3.

Fig. 5 is a diagrammatic representation of the system according to the invention.

Detailed description of the invention

In a first aspect the present invention provides a kitchen appliance for use with a built-in oven and for integration into a kitchen cabinet. The kitchen appliance comprises a box- shaped element adapted to be built into a kitchen cabinet over a built-in oven; said box-shaped element comprises an inlet duct and an outlet duct, said inlet duct and an outlet duct are connected so as to form a channel within said box- shaped element; wherein said box- shaped element comprising opening means for shifting the area at the inlet duct between an open and a closed state, thereby enabling removal of steam and smell of cooking as well as particles in air.

The kitchen appliance comprises an inlet duct which can suck in the air originating from an oven arranged immediately below the kitchen appliance.

In this way the kitchen appliance according to the invention makes it possible to avoid the disadvantages encountered by presence of particles in air, steam and smoke and smells originating from food being cooked in an oven.

In one embodiment of the kitchen appliance of the present invention, the box-shaped element comprising two side parts arranged essentially parallel and opposite to each other; and a top part and optionally a bottom part, and optionally a rear part; said top part and bottom part connecting said two side parts; said top part and said bottom part being planar and arranged essentially perpendicular to said side parts.

Such a design provides for easy and cost efficiency in production of the kitchen appliance. In one embodiment of the kitchen appliance of the present invention, the opening means comprises a non-stationary inner element configured to be displaced in and out of the box- shaped element, thereby enabling opening of the inlet duct.

Providing the kitchen appliance with a non-stationary inner element configured to be displaced in and out of the box- shaped element provides for improved suction efficiency during use as well as providing an extremely discrete appearance when not in use and wherein the non-stationary inner element is displaced in a closed configuration.

In one embodiment of the kitchen appliance of the present invention the non-stationary inner element is suspended in rails.

By suspending the non-stationary element in rails it is possible to obtain an easy and smooth movement of the non- stationary inner element when displaced in and out of the box-shaped element.

In one embodiment of the kitchen appliance of the present invention, the non- stationary inner element comprises two side parts arranged essentially parallel and opposite to each other; and a top part. In one embodiment of the kitchen appliance of the present invention, the non- stationary inner element comprises a front part, preferably a planar front part being arranged perpendicular to the side parts of said non-stationary inner element.

Such designs provides for easy and cost efficiency in production of the kitchen appliance. In one embodiment of the kitchen appliance of the present invention, the non- stationary inner element comprises one or more holes in its front part, thus allowing easy mounting of a fascia part having the specific visual appearance of the cabinets in a kitchen.

By providing a fascia on the front of the kitchen appliance, an extremely discrete appearance can be obtained in case that fascia resembles the style of the other cabinets of the kitchen in which the kitchen appliance is installed. The holes in the front part allows for easy and quick mounting of such a fascia part.

In one embodiment of the kitchen appliance of the present invention, the box-shaped element on its outer surface comprises a number of brackets, such as 2, 3, 4, 5, 6, 7 or 8 or more brackets, allowing easy mounting of said appliance in the interior of a kitchen element or a kitchen cabinet.

In one embodiment of the kitchen appliance of the present invention, the outlet duct extends out of the box-shaped element, preferably at a rear position of the box-shaped element.

By extending the outlet duct of the box- shaped element easy mounting of a hose for carrying away the air sucked into the appliance is established. In one embodiment of the kitchen appliance of the present invention, the appliance comprising an air filter, preferably arranged in the channel connecting said inlet duct and said outlet duct.

An air filter may filter off any grease or particle matter the presence of which may adversely affect a pump located downstream of the filter in case such any grease or particle matter enters such pump.

In one embodiment of the kitchen appliance of the present invention, the box-shaped element is having an outer width of 558 - 580 mm, such as 560 - 578 mm, e.g. 562 - 576 mm, for example 564 - 574 mm, such as 566 - 572 mm or 568 - 570 mm. In one embodiment of the kitchen appliance of the present invention, the said box-shaped element is having an outer height of 30 - 135 mm, such as 35 - 130 mm, such as 40 - 125 mm, e.g. 45 - 120 mm, for example 50 - 115 mm, such as 55 - 110 mm, e.g. 60 - 105 mm or 65 - 100 mm, for example 70 - 95 mm, such as 75 - 90 mm or 80 - 85 mm. Such dimensions will ensure that the kitchen appliance will fit into most existing kitchen cabinets.

In one embodiment of the kitchen appliance of the present invention, the opening means for shifting the area at the inlet duct between an open and a closed state, comprises an electrical switch for switching on and for switching off an electrical air suction pump to be used with said appliance.

By integrating an electrical switch for switching on and for switching off an electrical air suction pump with the opening means for shifting the area at the inlet duct between an open and a closed state, a user may shift the area at the inlet duct between a closed state and an open without also additionally and manually have to switch on an electrical pump switch. In one embodiment of this embodiment, the electrical switch being adapted to switching on said electrical air suction pump at various suction powers, such as in 2 - 5 steps or 3 - 4 steps, each step representing various suction powers selected form the range 10 - 100 %, such as 20 - 90 %, e.g. 30 - 80 %, for example 40 - 10 % such as 50 - 60 % of maximum suction power.

Such variations of possible suction powers allow a user to regulate the suction power with the needs, depending on the degree of smell, smoke and/or steam evolved during cooking of food in an oven.

In one embodiment of the kitchen appliance of the present invention, the switch is adapted to shift from a switched off state to a switched on state by pulling said non-stationary element a predefined distance out of the box- shaped element. In one embodiment of the kitchen appliance of the present invention, the opening means for shifting the area at the inlet duct between an open and a closed state comprises a spring- loaded lock adapted to allow the non- stationary element to be pulled out of the box-shaped element upon first pushing said non-stationary element a predetermined distance into said box-shaped element. Such features provide easy handling of the kitchen appliance during switching on and switching off the appliance.

In one embodiment the kitchen appliance of the present invention comprises one or more sensors, wherein said switch is adapted to shift from a switched off state to a switched on state by activation by one or more of said one or more sensors, said one or more sensors being selected from the group comprising a temperature sensor, a moisture sensor, a particle sensor, and a smoke sensor.

Such sensors provides for automatically operation of the kitchen appliance in terms of switching on and switching off the appliance. In one embodiment of the kitchen appliance of the present invention, the said non- stationary element and said box- shaped element are made of sheet metal.

Such a material has proven very well to withstand the damp conditions prevailing in a kitchen.

In one embodiment of the kitchen appliance of the present invention, an air suction pump being integrated in said appliance, wherein said suction pump being adapted to expel the air taken in via the inlet duct, through the outlet duct.

Integrating an air suction pump into the appliance provides for a very compact design which requires extremely little labour in installation.

In a second aspect the present invention provides a system comprising a kitchen appliance according to the first aspect of the present invention in combination with an external air suction pump and a hose; said air suction pump having an air inlet and an air outlet; and said hose being adapted to connect the inlet of said external air suction pump with the outlet duct of said kitchen appliance.

The provision of an external air suction pump provides for an extremely discrete appearance of the kitchen appliance of the system. Furthermore, by installing the air suction pump remotely, relative to the kitchen, such as on an attic above the kitchen, no noise form the air suction pump will be heard in the kitchen.

In one embodiment of the kitchen appliance of the present invention, the hose is having a cross-sectional area of 100 - 250 cm², such as 110 - 240 cm², e.g. 120 - 230 cm², for example 130 - 220 cm², such as 140 - 210 cm², e.g. 150 - 200 cm², for example 160 - 190 cm² or 170 - 180 cm².

In one embodiment of the kitchen appliance of the present invention, the external air suction pump is having a suction capacity of 500 m³ air/hour or more, such as 550 m³ air/hour or more, such as 600 m 3 air/hour or more, such as 650 m 3 air/hour or more, such as 700 m 3 air/hour or more, such as 750 m 3 air/hour or more, such as 800 m 3 air/hour or more, such as 850 m³ air hour or more.

Such cross-sectional areas of the hose and such capacity of the pump provide for good suction power to the kitchen appliance of the system. Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, fig. la shows an embodiment of a kitchen appliance 100 of the first aspect of the present invention in a plane side view. The appliance 100 comprises a box- shaped element 4 adapted to be built into a kitchen cabinet over a built-in oven. Fig. la shows one of two side parts 14,14' arranged essentially parallel and opposite to each other; and a top part 16 and a bottom part 18, and a rear part 20. The top part and bottom part are connecting the two side parts thus forming the box-shaped element. The box-shaped element 4 comprises an inlet duct 6 arranged at the front and an outlet duct 8 arranged at the rear. The inlet duct 6 and an outlet duct 8 are connected so as to form a channel 10 (not shown in fig. la) within said box-shaped element 4. The box-shaped element 4 comprising opening means 12 for shifting the area at the inlet duct between an open and a closed state, thereby enabling removal of steam and smell of cooking as well as particles in air. The opening means comprises a non-stationary inner element 22 configured to be displaced in and out of the box- shaped element, thereby enabling opening of the inlet duct 6.

The non- stationary inner element 22 itself comprises two side parts 26,26' (only side part 26 being seen in fig la) arranged essentially parallel and opposite to each other; and a top part 28. Furthermore, the non-stationary inner element 22 comprises a front part 30, which is arranged perpendicular to the side parts of said non-stationary inner element.

In fig. la the kitchen appliance is in its closed state in which the non-stationary inner element 22 is hidden within the interior of the box- shaped element 4. The movement of the non-stationary inner element 22 in relation to box-shaped element 4 is brought about by pulling non-stationary inner element 22 in a direction out of the interior of the box-shaped element 4. The non-stationary inner element 22 is suspended on a pair of rails 24 which make sure that the movement of the non-stationary inner element 22 takes place in a smooth manner and in which the movement is aligned with the extension in a depth direction of the box- shaped element 4.

In fig lb is seen in the embodiment of a kitchen appliance 100 of fig. la in a plane side view, wherein the non- stationary inner element 22 has been pulled out of the box-shaped element 4 in order to allow suction of steam and smell of cooking originating from an oven arranged below said appliance 100. In fig. lb the inlet duct 6 is forms by the area confined by the side parts 26,26' (only side part 26 being seen in fig 2) , the top part 28 and the front part 26 of the non- stationary inner element.

An electrical switch 38 will sense that the opening means 12 of the kitchen appliance 100 has been shifted from a closed to an open state and this will effect an air suction pump 40 (not shown in fig. lb) to start. Hereby air located in the vicinity of the inlet duct 6 of the appliance 100, and originating from food being cooked in an oven underneath will be sucked into the inlet duct 6 and out of the outlet duct 8 which may be connected to an ventilation duct leading the air out of the kitchen and out of the building in which the kitchen is located.

The air suction pump 40 may be an integrated air suction pump 46 or an external air suction pump 48.

In the vicinity of the inlet duct 6 may be arranged one or more sensors 44 which are adapted to sense that smoke, fumes, steam or particles are present. If this is the case, the kitchen appliance 100 is adapted to start the air suction pump 40 automatically. The one or more sensors 44 may be selected from the group comprising a temperature sensor, a moisture sensor, a particle sensor, and a smoke sensor.

Fig. 2 illustrates another embodiment of a kitchen appliance of the first aspect of the present invention. In fig. 2 the kitchen appliance is seen from its front side. The kitchen appliance comprises a box-shaped element 4 housing a non- stationary inner element 22.The box-shaped element 4 comprises a top part 16 and a bottom part 18 and two side parts. The non- stationary inner element 22 is suspended by resting on rails 24 rather than being suspended in rails by hanging. The kitchen appliance comprises brackets 34 for mounting the appliance inside a kitchen cabinet. Also seen in fig. 2 is the switch 38 that will be engaged and thereby switch on the suction pump connected to the outlet duct of the appliance by pulling out the non- stationary element 22.

Finally, fig. 2 shows that holes 32 are provided in the front plate of the non- stationary inner element 22. These holes makes it easy to mount a fascia onto the non-stationary inner element 22 in order to make the front of the kitchen appliance 100 resemble the style of the rest of the kitchen cabinets.

Fig. 3 and fig. 4 show an embodiment of the kitchen appliance 100 in a perspective view from above and from below, respectively. Fig. 3 and fig. 4 shows that the outer surface of the box- shaped element 4 is provided with four brackets 34. These serve the purpose of easing the mounting of the kitchen appliance 100 within the interior of a kitchen element or a kitchen cabinet.

Furthermore, fig. 4 shows that the inlet duct 6 of the appliance 100 is provided with a filter 36 for filtering off any particulate or greasy substances before the air is being led to the suction pump 40.

Fig. 5 illustrates the system 200 according to the second aspect of the present invention. The system 200 comprises a kitchen appliance 100 according to the first aspect combination with an external air suction pump 48 and a hose 50. The kitchen appliance 100 is built in into a kitchen cabinet 2 above an oven 300 which is also built into the kitchen cabinet. The hose 50 connects the outlet duct 8 of the kitchen appliance 100 with an inlet of the external pump 48. The external pump 48 is arranged above the ceiling 58, i.e. in the attic of the building housing the kitchen. A hose connects an outlet 54 of the pump 48 to the outside environment via a duct in the outer wall 60 of the building.

By the system 200 any steam, grease, smoke and smell of cooking originating from food being cooked in an oven may be sucked into the inlet duct 6 of the oven 300 and led to the outside environment thus improving the environment in the kitchen via the outlet duct 8 and the hose 50.

Although the invention has been described with reference to only a few embodiments it is to be understood that the invention comprises several other embodiments, which are all within the scope of the present invention. List of reference numerals

2 Kitchen cabinet

4 Box shaped element

6 Inlet duct

8 Outlet duct

10 Channel

12 Opening means

14,14' Side parts of box shaped element

16 Top part of box shaped element

18 Bottom part of box shaped element

20 Rear part of box shaped element

22 Non-stationary inner element

24 Rail

26,26 Side parts of non- stationary inner element 28 Top part of non-stationary inner element

30 Front part of non- stationary inner element

32 Hole in front part of non- stationary inner element

34 Brackets

36 Air filter

38 Electrical switch

40 Air suction pump

42 Spring loaded lock of non- stationary inner element

44 Sensor 46 Integrated air suction pump

48 External air suction pump

50 Hose

52 Inlet of external air suction pump 54 Outlet of external air suction pump

56 Wall of building

58 Ceiling of kitchen

60 Outer wall of kitchen

100 Kitchen appliance

200 System

300 Oven

W Outer width of box -shaped element

H Outer width of box-shaped element

Claims

1. A kitchen appliance (100) for use with a built-in oven and for integration into a kitchen cabinet (2); said kitchen appliance comprises a box-shaped element (4) adapted to be built into a kitchen cabinet over a built-in oven; said box-shaped element comprises an inlet duct (6) and an outlet duct (8), said inlet duct and an outlet duct are connected so as to form a channel (10) within said box- shaped element; wherein said box- shaped element comprising opening means (12) for shifting the area at the inlet duct between an open and a closed state, thereby enabling removal of particles in air, and steam and smell of cooking.

2. A kitchen appliance (100) according to claim 1, wherein said box-shaped element comprising two side parts (14,14') arranged essentially parallel and opposite to each other; and a top part (16) and optionally a bottom part (18), and optionally a rear part (20); said top part and bottom part connecting said two side parts; said top part and said bottom part being planar and arranged essentially perpendicular to said side parts (14,14').

3. A kitchen appliance (100) according to any of the claims 1 or 2, wherein said opening means (12) comprises a non- stationary inner element (22) configured to be displaced in and out of the box-shaped element, thereby enabling opening of the inlet duct (6).

4. A kitchen appliance (100) according to claim 3, wherein said non-stationary inner element (22) is suspended in rails (24).

5. A kitchen appliance (100) according to claim 3 or 4, wherein said non- stationary inner element comprises two side parts (26,26') arranged essentially parallel and opposite to each other; and a top part (28).

6. A kitchen appliance (100) according to any of the claims 3 - 5, wherein said non- stationary inner element (22) comprising a front part (30), preferably a planar front part being arranged perpendicular to the side parts of said non- stationary inner element.

7. A kitchen appliance (100) according to claim 6, wherein said front part of said non- stationary inner element comprising one or more holes (32), thus allowing easy mounting of a fascia part having the specific visual appearance of the cabinets in a kitchen.

8. A kitchen appliance (100) according to any of the preceding claims, wherein the box- shaped element on its outer surface comprises a number of brackets (34), such as 2, 3, 4, 5, 6, 7 or 8 or more brackets, allowing easy mounting of said appliance in the interior of a kitchen element or a kitchen cabinet.

9. A kitchen appliance (100) according to any of the preceding claims, wherein the outlet duct (8) extends out of the box-shaped element, preferably at a rear position of the box-shaped element (4).

10. A kitchen appliance (100) according to any of the preceding claims, said appliance comprising an air filter (36), preferably arranged in the channel (10) connecting said inlet duct and said outlet duct.

11. A kitchen appliance (100) according to any of the preceding claims, wherein said box- shaped element is having an outer width (W) of 558 - 580 mm, such as 560 - 578 mm, e.g.

562 - 576 mm, for example 564 - 574 mm, such as 566 - 572 mm or 568 - 570 mm.

12. A kitchen appliance (100) according to any of the preceding claims, wherein said box- shaped element is having an outer height (H) of 30 - 135 mm, such as 35 - 130 mm, such as 40 - 125 mm, e.g. 45 - 120 mm, for example 50 - 115 mm, such as 55 - 110 mm, e.g. 60 - 105 mm or 65 - 100 mm, for example 70 - 95 mm, such as 75 - 90 mm or 80 - 85 mm.

13. A kitchen appliance (100) according to any of the preceding claims, wherein said opening means for shifting the area at the inlet duct between an open and a closed state, comprises an electrical switch (38) for switching on and for switching off an electrical air suction pump (40) to be used with said appliance.

14. A kitchen appliance (100) according to claim 13, wherein said electrical switch (38) being adapted to switching on said electrical air suction pump at various suction powers, such as in 2 - 5 steps or 3 - 4 steps, each step representing various suction powers selected form the range 10 - 100 %, such as 20 - 90 %, e.g. 30 - 80 %, for example 40 - 70 % such as 50 - 60 % of maximum suction power.

15. A kitchen appliance (100) according to claim 13 or 14, wherein said electrical switch (38) is adapted to shift from a switched off state to a switched on state by pulling said non- stationary element a predefined distance out of the box-shaped element (4).

16. A kitchen appliance (100) according to any of the claims 3 - 15, wherein said opening means for shifting the area at the inlet duct between an open and a closed state comprises a spring-loaded lock (42) adapted to allow the non- stationary element to be pulled out of the box-shaped element upon first pushing said non- stationary element (22) a predetermined distance into said box- shaped element (4).

17. A kitchen appliance (100) according to claim 13, comprising one or more sensors (44), wherein said electrical switch (38) is adapted to shift from a switched off state to a switched on state by activation by one or more of said one or more sensors, said one or more sensors being selected from the group comprising a temperature sensor, a moisture sensor, a particle sensor, and a smoke sensor.

18. A kitchen appliance (100) according to any of the preceding claims, wherein said non- stationary element and said box-shaped element are made of sheet metal.

19. A kitchen appliance (100) according to any of the preceding claims, wherein an air suction pump (46) being integrated in said appliance, wherein said suction pump being adapted to expel the air taken in via the inlet duct (6), through the outlet duct (8).

20. A system (200) comprising a kitchen appliance (100) according to any of the claims 1 - 19 in combination with an external air suction pump (48) and a hose (50); said air suction pump having an air inlet (52) and an air outlet (54); and said hose being adapted to connect the inlet of said external air suction pump with the outlet duct (8) of said kitchen appliance.

21. A system (200) according to claim 20, wherein said hose is having a cross-sectional area of 100 - 250 cm², such as 110 - 240 cm², e.g. 120 - 230 cm², for example 130 - 220 cm², such as 140 - 210 cm², e.g. 150 - 200 cm², for example 160 - 190 cm² or 170 - 180 cm².

22. A system according to any of the claims 20 - 21, wherein said external air suction pump (48) is having a suction capacity of 500 m³ air/hour or more, such as 550 m³ air/hour or more, such as 600 m 3 air hour or more, such as 650 m 3 air hour or more, such as 700 m 3 air/hour or more, such as 750 m 3 air/hour or more, such as 800 m 3 air/hour or more, such as 850 m 3 air/hour or more.