DE102017109986A1 - Base ventilation box for mounting in a furniture base, a furniture base and a corresponding downdraft extractor - Google Patents

Abstract

The invention relates to a base ventilation box (1) for mounting in a furniture base (100), wherein the base ventilation box (1) has at least one air outlet (2) covered by an exhaust grille (23) and at least one air inlet (3), characterized in that an inner side (5) of an upper side (6) of the base ventilation box (1) and / or one of the upper side (6) opposite underside (7) of the base ventilation box (1) has a receptacle (8) for a support foot (9) Furthermore, a corresponding furniture base and a downdraft extractor device will be described.

Description

Base ventilation box for mounting in a furniture base, wherein the base ventilation box has at least one air outlet covered by an exhaust grille and at least one air inlet. Such a base ventilation box is from the DE 10 2015 103 034 A1 known. Similar pedestal ventilation boxes also describe the DE 10 2015 103 030 A1 , the DE 10 2015 213 471 A1 and the DE 10 2009 025 038 A1 ,

Skirting boxes of the type described above are particularly in so-called downdraft extractor applications in which sucked during cooking fumes sucked directly on the hob, passed through the kitchen furniture and blown out after suitable filtration as filtered air through the base of the furniture in the room. In particular, the passage of the fumes through the base region of the kitchen furniture is sometimes structurally complex, since the air duct system in the base can collide with the leg elements of the kitchen furniture arranged there and the air duct system must therefore be guided around the legs under a correspondingly high parts cost. The sometimes voluminous base ventilation boxes for the filtration and the air outlet in the kitchen space cause structural difficulties.

It is therefore an object of the invention to develop a base ventilation box of the type described above such that it allows comfortable installation and placement in the furniture base of a kitchen cabinet.

This object is achieved by a pedestal ventilation box with the features of claim 1. The independent claim 16 relates to a corresponding furniture base and the independent claim 17 a corresponding downdraft extractor device. Advantageous embodiments of the invention are the subject of the dependent claims.

Accordingly, it is provided in a base ventilation box that an inner side of an upper side of the base ventilation box and / or a top side opposite bottom of the base ventilation box has a receptacle for a support leg or for a plurality of support legs.

The base ventilation box thus makes it possible that it can be installed in the furniture base instead of a possibly existing on-site furniture foot and thereby mitübernimmt the support provided by the furniture foot support function. For this purpose, at least one support foot can be accommodated in the receptacle and extend in the interior of the base ventilation box between an upper side of the base ventilation box and an underside of the base ventilation box. Preferably, the support foot can be held in the receptacle via a positive connection.

The base ventilation box may have at least one air guide element which is accommodated in the base ventilation box, wherein air flowing in via the air guide element into the base ventilation box is diverted in the direction of the air outlet.

Both the top and the bottom can have at least one receptacle of the type described above. Depending on a recording of the upper part and lower part can be arranged in alignment opposite. In this case, the support leg may be received in a first of the receptacles with a first of its opposite ends and in a second of the receptacles with an end opposite the first end.

The base ventilation box can rest with its underside on a base, for example on a building floor. Furthermore, a bottom element of a piece of furniture can be supported on the upper side of the base ventilation box.

If a height compensation, for example, between the top of the base ventilation box and a bottom element of a piece of furniture, is required, it can be provided that a spacer, in particular a spacer sleeve, is arranged in alignment with the support leg on an outer side of the upper side, on whose side facing away from the outside support side the floor element is placed and supported. Conveniently, the spacer in the direction perpendicular to the top of the base ventilation box on a dimension which corresponds precisely to the distance to be overcome between the top and the bottom element. The floor element can be supported on the base via the spacer, the upper side of the base ventilation box, the support foot and the underside of the base ventilation box. The support foot and / or the spacer can be height or length adjustable.

The upper side of the base ventilation box can be formed by an upper part and the underside of the base ventilation box can be formed by a lower part, which are connected to one another via a connection point, in particular an adhesive connection. The upper part and the lower part may be plastic injection molded parts. The upper part and the lower part can in particular be designed as identical parts.

The upper part and the lower part may each have at least one arcuate groove opposite to their respective inner side, in FIG which extends the spoiler with opposite longitudinal edges.

A first air inlet may be disposed in a first plane, a second air inlet in a second plane spaced parallel to the first plane, and the air outlet in a third plane orthogonal to the first and second orthogonal planes and between the first and second air inlets.

The second air inlet can also have the function of a second air inlet, for example, when in a Anreihsituation of several base ventilation boxes on the first air inlet of a first base ventilation box air flows and partially exits via the air outlet with the exhaust grille from the first base ventilation box, and partially on the second "Air inlet" flows out of the first base ventilation box in order to flow in via the air inlet of a second base ventilation box into a second base ventilation box.

The upper part and the lower part may have on their inner side opposite a first and a second pair of arcuate grooves, wherein the first pair of arcuate grooves is guided from the air outlet to the first air inlet and the second pair of arcuate grooves from the air outlet to the second air inlet , In order to vary the air flow within the base ventilation box, it can be provided, in particular, that the upper and lower parts have on their inner sides opposite one another several pairs of arcuate grooves, which, however, are led away from the air outlet to the same air inlet at a distance from one another. The clearance may expand outgoing from the air outlet in the course of the grooves in the direction of the air inlet. If, furthermore, upper part and lower part are identical parts, assembly can take place independently of the direction of flow and, after the preassembly of the housing in the base region, it is only necessary for the air guide elements to be inserted into the corresponding pairs of grooves as required.

The upper part and the lower part can each have a curved groove formed as a parabolic groove on their inner sides opposite one another.

A curvature geometry of the various pairs of arcuate grooves may be identical so that the same air guide element having the same curvature geometry as the arcuate grooves may be selectively inserted over its opposite longitudinal edges into any pair of opposed arcuate grooves.

The base ventilation box may have a waisted shape, with a wide portion of which the exhaust grille is supported and having at least a first width corresponding to a filter width, and having a narrow portion adjoining the wide portion and having a second width. which is smaller than the filter width, wherein the at least one air inlet is arranged on an outside of the narrow region arranged in the width direction of the narrow region. If the base ventilation box has two air inlets or an air inlet and another air outlet, then these can be arranged in width direction of the narrow region on opposite outer sides of the narrow region. Due to the waisted shape of the base ventilation box is particularly space-saving.

According to another aspect, a furniture base is described, in which a base ventilation box of the type described above is mounted, with a directed to the outside of the furniture base free edge of the bottom of the base ventilation box is set back against a front escape of the furniture base, and wherein a sealing lip on a lower edge of the Abluftgitters between the free edge and the front escape of the furniture base is arranged and sealingly against a base of the furniture base, in particular on a building floor, is applied.

In accordance with yet another aspect, a downdraft extractor with at least one base vent box of the type described above is disclosed in which the base vent box is open with the air outlet to an outside of the furniture base, and wherein the base vent box and a downdraft extractor an air guide arrangement are connected. Via the downdraft extractor fumes are introduced from a hob on a top of a set up on the furniture base furniture vapors in the air duct assembly, passed through the air duct assembly and blown through the air outlet of the at least one base ventilation box from the air duct assembly.

For installation, the base ventilation box can be inserted from the front of the furniture base into the furniture base and then fixed to the skirting board. As described above, the base ventilation box may have a receptacle for positioning a support leg. This receptacle may in particular be a form-fitting receptacle on the inside of the upper part or of the lower part of the base ventilation box. The support foot can be optionally inserted to provide stability to the overlying structure. For example, the support foot one on site replace existing furniture foot of a kitchen cabinet. To fix the support leg of this can be used in the described recording and height adjustment, in particular a length adjustment of the support leg, are set via a bias between the top and bottom of the base ventilation box.

The base ventilation box may have guide bodies in the interior, which direct a portion of the guided volume flow in the direction of the air outlet and thus reduce the pressure loss in the base ventilation box. The length of the guide body may be dependent on the respective position of the base ventilation box. In particular, an air-guiding arrangement can have a plurality of base ventilation boxes connected in series one behind another of the type described above. The base ventilation boxes can be fluidly connected in series via flexible hoses or the like. In the case of the first base ventilation box in the direction of flow, part of the airflow can be supplied to the outlet of this base ventilation box, while another part of the airflow is forwarded to the base ventilation box (s) following in the direction of flow. At the last in the flow direction base ventilation box (almost) the entire residual flow in the direction of the air outlet of the respective base ventilation box can be deflected.

The spoiler elements can be clamped in the interior of the base ventilation box between the top and the bottom of the base ventilation box, preferably a releasable connection between the air guide elements and the top and bottom is made so that the air guide elements can be removed and repositioned as needed , In particular, a plurality of possibly differently curved air guide elements can be used in a base ventilation box. The air guide elements can have a constant or variable cross-section in the flow direction.

Upstream of the air outlet in the flow direction, the base ventilation box may have a condensate retention edge, which prevents the escape of accumulated condensate from the base ventilation box. For connecting the base ventilation box to a flexible hose or a ventilation pipe, an adapter may be provided, which is connected to the base ventilation box, for example via a clip connection. The flexible hose can be pushed over the adapter and fixed in a fluid-tight manner with the aid of a hose clamp or the like. If the base ventilation box has a plurality of air inlets, it can be provided that an unused air inlet can be optionally closed by means of a cover. In the case of an arrangement of a plurality of base ventilation boxes connected in series one behind the other, as described above, in particular the last base ventilation box in the direction of air flow can have an air inlet closed by a cover.

The base ventilation box can be tailored, so that the described flexible hose adapter does not protrude laterally excessively. This allows installation even at a very small distance existing furniture feet, without the furniture feet must be removed.

The surface of the air outlet may be covered by an activated carbon filter, wherein the filter surface may be curved one or more times. Compared to a straight filter, the filter surface is thereby increased and, accordingly, due to the increased flow resistance, the flow rate through the filter medium is reduced, thereby increasing the filter effect. The curvature of the filter has the advantage that the air always flows through filter layers, which are first stretched and then compressed. As a result, the mass transfer between activated carbon and odor particles is enhanced and the filter effect intensified.

An exhaust grille of the base ventilation box may consist of aerodynamically shaped lamellae, wherein the activated carbon filter forms a unit together with the ventilation grille. Both elements can be fixed to a bracket, which sit on the left and right of the unit. It can be provided that the unit can be inserted by a magnetic connection in the base ventilation box and can be fixed to this.

The slats can be individually inserted into the holder and at any time assembled and disassembled by means of clip connection. A lowermost lamella may differ from the other lamellas in that it is adapted to terminate with its lower edge on a support, for example on a building floor, and to this end have an additional seal, for example a sealing lip.

The exhaust air can be fed to the base ventilation box or the base ventilation boxes via a flexible hose or a rigid channel from a fan, for example a downdraft extractor. Due to the installation situation, the channel may preferably have a rectangular cross-section. The air can be passed through one or more series-connected base ventilation boxes of the type described above, wherein the number of base ventilation boxes can be selected depending on the situation. Due to the pressure loss and the cleaning effect of the activated carbon filter can be used depending on the application, preferably two to three base ventilation boxes application.

The exhaust grille can be connected on the inside with a filter insert. The filter insert may have a flat or a curved or multiple curved filter substrate. The arcuate or multiply curved filter substrate may be attached to the exhaust grate via its opposite ends. In order to further increase the cross section of the filter substrate, it can be provided that the arcuate or multiply curved filter substrate is arranged around the at least one support leg.

• 1 eine erste Ausführungsform einer in einem Möbelsockel eingebauten Sockellüftungsbox in perspektivischer Darstellung;
• 2 in perspektivischer Draufsicht auf die Innenseite ein Oberteil oder ein Unterteil einer Sockellüftungsbox gemäß einer Ausführungsform der Erfindung;
• 3 eine perspektivische Sicht auf einen Lufteinlass einer Sockellüftungsbox gemäß einer Ausführungsform der Erfindung;
• 4 eine perspektivische Draufsicht auf eine Sockellüftungsbox gemäß einer Ausführungsform der Erfindung mit abgenommenem Oberteil;
• 5 eine Querschnittsansicht einer Einbausituation einer Sockellüftungsbox in schematischer Darstellung;
• 6 eine Luftführungsanordnung in einem Möbelsockel unter Verwendung mehrerer Sockellüftungsboxen gemäß einer Ausführungsform der Erfindung;
• 7 eine weitere Ausführungsform einer in einem Möbelsockel eingebauten Sockellüftungsbox in perspektivischer Darstellung; und
• 8 noch eine weitere Ausführungsform einer in einem Möbelsockel eingebauten Sockellüftungsbox in perspektivischer Darstellung.

Further details of the invention will be explained with reference to the following figures. Showing:

• 1 a first embodiment of a built-in furniture base pedestal ventilation box in perspective view;
• 2 in perspective plan view of the inside an upper part or a lower part of a base ventilation box according to an embodiment of the invention;
• 3 a perspective view of an air inlet of a base ventilation box according to an embodiment of the invention;
• 4 a top perspective view of a base ventilation box according to an embodiment of the invention with the top removed;
• 5 a cross-sectional view of a mounting situation of a base ventilation box in a schematic representation;
• 6 an air duct assembly in a furniture base using a plurality of base ventilation boxes according to an embodiment of the invention;
• 7 a further embodiment of a built-in furniture base pedestal ventilation box in perspective view; and
• 8th Yet another embodiment of a built-in furniture base pedestal ventilation box in perspective view.

The 1 shows an example of an embodiment of a furniture base 100 built-in base ventilation box 1 with extracted exhaust grille 23 and on the inside attached filter cartridge 18 , The base ventilation box 1 is over an opening in the front of the socket 100 in the pedestal 100 pushed in, so that the. Sockellüftungsbox 1 for example, below a kitchen cabinet in the furniture base 100 located. The base ventilation box 1 has an air outlet 2 as well as two air intakes 3 on. One of the air inlets 3 is with a cover 20 locked. Over the other, unlocked air intake 3 can the pedestal ventilation box 1 be connected to an air duct assembly of a downdraft extractor device. A corresponding downdraft extractor device is for example from the DE 10 2015 103 034 A1 Therefore, it should not be further described in detail herein.

The base ventilation box 1 has a top 13 and a lower part 14 on, which may be formed substantially as equal parts. The top 13 and the lower part 14 are via a connection point 19 For example, a splice is bonded together. The top 13 and the lower part 14 For example, each may be formed as an injection molded plastic molding. The top 13 and the lower part 14 each have on their inside 5 a recording 8th on. The pictures 8th are arranged to face each other in alignment. In particular, the shots 8th a form-fitting receptacle for the positive reception of a support leg (not shown) to the upper part 13 opposite the lower part 14 support so that the base ventilation box 1 can take over the functions of a furniture foot. To a decentered load the base ventilation box outside the recordings 8th To avoid that is on the inside 5 of the top 13 trained recording 8th also on the outside 10 of the top 6 the base ventilation box 1 forming shell 13 recognizable.

One to the front of the pedestal 10 directed edge 16 of the lower part 14 the base ventilation box 1 is opposite a front escape of the furniture pedestal 100 arranged back, which is characterized by the two arrows directed towards each other. In the air outlet 2 used exhaust grille 23 and filter cartridge 18 is in the area between the edge 16 and the front escape of the furniture base 100 a sealing lip 17 arranged, which the exhaust grille 23 opposite a documentation of the base ventilation box 1 , For example, a building floor, can seal.

In the synopsis of 1 and 2 it can be seen that opposite the edge 16 put back a first survey 21 and a second survey 23 on the inside 5 is trained. The in terms of the edge 16 first survey 26 is a fixation survey, using which the filter cartridge 18 in the air outlet 2 in its mounting position and thus also the exhaust grille 23 held and sealed. The parallel to the fixation survey 26 further into the interior of the pedestal ventilation box 1 relocated survey 21 is a condensate retention edge, which is continuous between the opposite partitions 27 of the upper part or of the lower part 13 . 14 extends.

2 lets continue to recognize that the recording 18 essentially as an annular one Elevation on the inside 5 of the top 13 or of the lower part 14 may be formed, with an inner diameter, which may correspond to the outer diameter of a support leg (not shown), so that the recording 8th forms a positive connection for the support foot.

The top 13 or the lower part 14 continues on its inside 5 a plurality of grooves 15 which can serve to receive an air guiding element (not shown). As can be seen, there are two grooves 15 formed, which differs from the air outlet 2 towards a first of the two air inlets 3 extend and two further grooves 15 extending from the air outlet 2 towards a second of the air inlets 3 extend. The two to the same air intake 3 extending grooves 15 each extend from an edge region of the air outlet 2 starting at different areas of the respective air intake 3 , Depending on which of the two in the direction of the same air intake 3 extending grooves 15 an air guide is used, there is a different subdivision of the air flow, for example, the base ventilation box 1 to a baying situation of several base ventilation boxes (cf. 6 ).

3 shows an embodiment of a base ventilation box 1 in which one of the two air intakes 3 over a cover 20 is closed. The top 13 and the lower part 14 the in 3 shown base ventilation box 1 can according to the in 2 shown upper part 13 or lower part 14 be educated. As in 3 it can be seen is in both grooves 15 extending between the air outlet 2 and the open air intake 3 extend, each an air guide 4 inserted so that the over the open air inlet 3 entering air flow from the inflow direction perpendicular to the air inlet cross-section in the air outlet direction perpendicular to the air outlet 2 is continuously deflected and thereby turbulence within the base ventilation box and, accordingly, pressure losses are reduced.

Further details of the arrangement according to 3 are in 4 which also shows that the exhaust grille 23 in its mounting position shown in relation to the furniture base 100 is arranged that the exhaust grille 23 with the outside of the furniture base 100 flees. To the pedestal ventilation box 100 to connect to a duct system of an air duct assembly, the open air inlet 3 a flexible hose adapter 22 on top of the air intake 3 may be snapped and which has an outer contour, which allows a fixation of a flexible hose, for example by means of a hose clamp.

In 5 schematically an exemplary arrangement is shown in which a furniture floor 300 via a pedestal ventilation box according to the invention 1 on a pad 200 , Is supported, for example, a building floor. The base ventilation box 1 points to her insides 5 from top 6 and bottom 7 one recording each 8th on, between which is a support leg 9 extending, with a first of its opposite ends in the receptacle 8th on the inside 5 the top 6 is received, and with a first end opposite the second end in one on the inside 5 the bottom 7 trained recording is included and thus the top 6 opposite the bottom 7 supported. Escaping with the shots 8th and the support foot 9 is on the outside 10 the top 6 a spacer 11 arranged, which is a distance between the outside 10 the top 6 and the furniture floor 300 bridged, so that finally the furniture floor 300 over the spacer 11 , the top 6 , the support foot 9 and the bottom 7 on the pad 2 is supported.

The base ventilation box 1 is thus not only an integral part of an exhaust air system with appropriate airflow function. Rather, according to the invention, it has a dual function in that, in addition to its air guiding function, it is also provided for supporting the furniture in its base 100 the base ventilation box 1 is arranged. This allows a manufacturer on the furniture floor 300 intended furniture foot removed and instead by the in 5 shown arrangement can be replaced without affecting the stability of the furniture is affected.

The 6 shows finally an air duct assembly, in which three base ventilation boxes 1 are connected in series. When using the base ventilation box 100 is in the in the illustration according to 6 left pedestal ventilation box 1 as well as in the middle pedestal ventilation box 1 the right air intake opening 3 actually an air outlet opening, as through this in each case not on the air guide 4 the respective base ventilation box 1 derived air volume flow to the subsequent in the air flow direction base ventilation box 1 is passed through. The pedestal ventilation boxes 1 are over flexible hoses 25 connected to an air duct system, for example, a downdraft extractor device and interconnected. The right in the representation and in the flow direction last air inlet 3 is over a cover 20 locked. As with respect to 5 has been described, the middle in the representation middle pedestal ventilation box 1 a support foot 9 on.

The in the 7 and 8th Embodiments shown differ from the according to 4 in particular, that the arcuate groove 15 is formed elliptical and thus a continuous, one-piece groove is formed, in which the air guide 4 optionally in one of its two halves can be used, depending on which inlet 3 closed with the cover, the air from the respective open inlet 3 in the direction of the outlet 2 redirect.

While the filter substrate 24 in the embodiment according to 8th straight and parallel to the exhaust grille 23 is arranged, is the substrate 24 in the embodiment according to 7 arched around the support leg 9 arranged around so that it has a correspondingly larger filter area and, as measured in the air flow direction, a greater effective thickness.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential to the realization of the invention both individually and in any combination.

LIST OF REFERENCE NUMBERS

1

Sockellüftungsbox

2

air outlet

3

air intake

4

air guide

5

inside

6

top

7

bottom

8th

admission

9

Support foot

10

outside

11

spacer

12

support page

13

top

14

lower part

15

groove

16

edge

17

sealing lip

18

filter cartridge

19

junction

20

cover

21

Condensate retaining edge

22

Flex hose adapter

23

Abluftgitter

24

filter substrate

25

Flex hose

26

Fixiererhebung

27

partial wall

28

filter substrate

100

furniture base

200

document

300

floor element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015103034 A1 [0001, 0032]
• DE 102015103030 A1 [0001]
• DE 102015213471 A1 [0001]
• DE 102009025038 A1 [0001]

Claims (17)

Base ventilation box (1) for mounting in a furniture base (100), wherein the base ventilation box (1) at least one of an exhaust grille (23) covered air outlet (2) and at least one air inlet (3), characterized in that an inner side (5 ) an upper side (6) of the base ventilation box (1) and / or one of the top (6) opposite underside (7) of the base ventilation box (1) has a receptacle (8) for a support foot (9). Base ventilation box (1) after Claim 1 in which at least one air guide element (4) is accommodated in the base ventilation box (1) via which air flowing into the base ventilation box (1) is diverted in the direction of the air outlet (3). Base ventilation box (1) after Claim 1 or 2 in which at least one support leg (9) is accommodated in the receptacle (8) and extends inside the base ventilation box (1) between the upper side (6) of the base ventilation box (1) and the underside (7) of the base ventilation box (1) and is preferably held via a positive connection in the receptacle (8). Base ventilation box (1) after Claim 3 in which both the upper side (6) and the inner side (5) have a receptacle (8) which are aligned so as to lie opposite one another, the support foot (9) being connected to a first of its opposite ends in a first one of the receptacles (8 ) and is received with a first end opposite the end in a second of the receptacles (8). Base ventilation box (1) after Claim 3 or 4 in which the base ventilation box (1) with its lower side (7) rests on a base (200), in particular a building floor, and on the upper side (6) of which a floor element (300) of a piece of furniture is supported. Base ventilation box (1) after Claim 5 in which a spacer (11), in particular a spacer sleeve, is arranged on the outer side (10) of the upper side (6) in alignment with the support leg (9), on the upper support side (12) facing away from the outer side (10) (300) is supported. Base ventilation box (1) after Claim 6 in which the floor element (300) is supported on the base (200) by the spacer (11), the upper side (6) of the base ventilation box (1), the support foot (9) and the underside (7) of the base ventilation box (1) , Base ventilation box (1) according to one of the preceding claims, in which the upper side (6) of the base ventilation box (1) is formed by an upper part (13) and the lower side (7) of the base ventilation box (1) is formed by a lower part (14) a connection point (19), in particular an adhesive connection, are connected to one another, wherein the upper part (13) and the lower part (14) are preferably designed as identical parts. Base ventilation box (1) according to one of the preceding claims, wherein the top (6) of the base ventilation box (1) from an upper part (13) and the underside (7) of the base ventilation box (1) by a lower part (14) is formed, wherein the Upper part (13) and the lower part (14) on their inner sides (5) opposite each having at least one arcuate groove (15) into which the air guide element (4) extends with opposite longitudinal edges. A pedestal ventilation box (1) according to any one of the preceding claims, wherein a first air inlet (3) in a first plane, a second air inlet (3) in a second plane spaced parallel to the first plane and the air outlet (2) in one of the first and the second plane orthogonally arranged third level and between the first and the second air inlet (3) is arranged. Base ventilation box (1) after Claim 10 as far as this up Claim 8 in that the upper part (13) and the lower part (14) have on their inner sides (5) opposite to each other a first and a second pair of arcuate grooves (15), the first pair of arcuate grooves (15) starting from the air outlet (2) to the first air inlet or (3) and the second pair of arcuate grooves (15) from the air outlet (2) to the second air inlet (3) is guided. Base ventilation box (1) after Claim 10 as far as this up Claim 9 refers, or after Claim 10 in which the upper part (13) and the lower part (14) each have on their inner sides (5) an arcuate groove (15) formed as a parabolic groove. Base ventilation box (1) after Claim 11 or 12 in that a curvature geometry of the arcuate grooves (15) is identical, so that the same air guide element (4) with the curvature geometry over its opposite longitudinal edges selectively in the first pair of opposing arcuate grooves (15) or in the second pair of opposed arcuate grooves ( 15) can be included. Base ventilation box (1) according to one of the preceding claims, in which the exhaust air grille (23) is connected on the inside to a filter insert (18) which has an arcuately or multiply curved filter substrate (28). Base ventilation box (1) according to one of the preceding claims, which has a waisted shape comprising, with a wide portion, of which the exhaust grille (23) is held and which has at least a first width corresponding to a filter width, and a narrow portion adjoining the wide portion and having a second width which is smaller than that Filter width is, wherein the at least one air inlet (3) is arranged on an arranged in the width direction of the narrow region outside of the narrow region. Furniture base (100) in which a base ventilation box (1) is mounted according to one of the preceding claims, wherein a free edge (16) directed towards the outside of the furniture base (100) of the underside (7) of the base ventilation box (1) against a front escape of Furniture Base (100) is offset back, and wherein a sealing lip (17) on a lower edge of the cover grid (23) between the free edge (16) and the front alignment of the furniture base (100) is arranged and sealingly against a base (200) of the Furniture base (100), in particular rests on a building floor. Downdraft fume extractor with a in a furniture base (100) mounted base ventilation box (1) according to one of Claims 1 to 13 in which the base ventilation box (1) with the air outlet (2) is open to an outside of the furniture base (100), and wherein the base ventilation box (1) and a downdraft extractor are connected to an air guide arrangement, wherein the downdraft extractor introduced from a hob at an upper side of a furniture on the furniture base (100) furniture Wrasen in the air duct assembly, passed through the air duct assembly and blown through the air outlet (2) of the base ventilation box (1) from the air duct assembly.

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