Abstract:
The present invention relates to a room delimitation element, in particular to a door or a wall, which may be used for a sanitary room in vehicles or buildings.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates to a room delimitation element, in particular to a door or a wall, which may be used for a sanitary room in vehicles or buildings. 
       DISCUSSION OF THE PRIOR ART 
       [0002]    In order to ensure air exchange which is sufficient in terms of hygiene, sanitary rooms without windows (to the outside which can be opened) typically have to be provided with an extractor for conveying away humid exhaust air and with an incoming air opening for guiding intake air. The incoming air openings have to have a certain available cross section, so that a sufficient amount of fresh air may flow into the sanitary room and that no negative pressure is created in the sanitary room. A simple conventional solution for such incoming air openings are ventilation grills which are attached to through openings at the base of a door. Such ventilation grills are usually devised such that sufficient air flow is enabled on the one hand, and that tightness in terms of sight and light is ensured on the other hand. 
         [0003]    In some fields of application, there is a demand for room delimitation elements which additionally have a sound absorption or sound insulation effect. For example, while the majority of flushing noises in the sanitary room in older types of aircraft are drowned out by the operating noise of the aircraft, the noise level within cabins of modern aircraft types is significantly lower, which is why the noises emanating from the sanitary room are perceptible by passengers in the cabin. The acoustic insulation of the sanitary room in modern (commercial) aircraft, for example, which will be even quieter in the future is thus of increasing importance. 
       SUMMARY OF THE INVENTION 
       [0004]    The invention is therefore based on the object of achieving an improved room delimitation element which despite the provision of a sufficient air passage can ensure sufficient acoustic insulation. 
         [0005]    This object is achieved by a room delimitation element having the features of claim  1 . Particularly preferred design embodiments and refinements of the invention are the subject matter of the dependent claims. 
         [0006]    The room delimitation element of the invention has a through opening which in a thickness direction of the room delimitation element extends through the entire room delimitation element, and an insert which is disposed in and/or ahead of the through opening and which in directions which are transverse to the thickness direction of the room delimitation element extends in each case at least across the entire through opening. The insert on its part has at least one air-passage region in the region of the through opening and at least one sound absorption region, wherein the at least one sound absorption region is disposed beside the air-passage region in a direction which is transverse to the thickness direction of the room delimitation element. This at least one sound absorption region has at least one sound absorption element which has a sound absorption effect in a direction which is transverse to the thickness direction of the room delimitation element; and the at least one air-passage region in the thickness direction of the room delimitation element has at least two layers of a plurality of sound reflection elements, wherein the sound reflection elements in one layer are in each case mutually spaced apart in a direction which is transverse to the thickness direction of the room delimitation element and the sound reflection elements in different layers are disposed so as to be mutually offset in a direction which is transverse to the thickness direction of the room delimitation element. 
         [0007]    Instead of a conventional ventilation grill, a special insert which unifies the functional features of air permeability and sound absorption is inserted in/ahead of the through opening in the room delimitation element of the invention. In this way, a flow opening having a sufficient available cross section can be provided and, simultaneously, sufficient acoustic insulation can be achieved. Since the sound absorption elements are not disposed in the air-passage region, air flow is not compromised by said sound absorption elements. The sound reflection elements in the air-passage region of the insert permit a sufficient available cross section for air flow. On account of their mutually offset disposal in at least two layers, the sound reflection elements reflect at least part of the sound impacting the insert multiple times between them and also laterally in the direction towards the at least one sound absorption region. Altogether, a sound damping value of 2 to 3 dB(A) and more may be achieved for the relevant frequency range using the insert, preferably at an available cross section of about 200 cm 2 . 
         [0008]    The room delimitation element according to the invention is preferably designed as a door or a wall, in particular a door or a wall of a sanitary room. This door or wall, respectively, is preferably employable in a vehicle (aircraft, watercraft, landcraft) or in a building. 
         [0009]    The insert in directions which are transverse to the thickness direction of the room delimitation element extends in each case at least across the entire through opening. That is to say that the insert preferably in at least one direction which is transverse to the thickness direction of the room delimitation element protrudes into a material portion of the room delimitation element which adjoins the through opening. The at least one air-passage region of the insert here is disposed in the region of the through opening. That is to say that the entire air-passage region preferably extends within the through opening of the room delimitation element, but the former may alternatively also be partially positioned outside the through opening, for example for reasons of assembly or design. On the other hand, the room delimitation element has at least one clearance which adjoins the through opening in a direction which is transverse to the thickness direction of the room delimitation element. At least one of the at least one sound absorption regions of the insert is then at least partially disposed within at least one of these at least one clearances. If required, the air-passage region of the insert may also protrude into at least one of these at least one clearances. As opposed to the through opening, the at least one clearance in the thickness direction of the room delimitation element does not extend through the entire room delimitation element but is preferably designed as pocket in a wall of the room delimitation element, which is closed on one or both sides in the thickness direction of the room delimitation element. Alternatively, the sound absorption regions of the insert may also be positioned so as to be completely within the through opening of the room delimitation element. 
         [0010]    The term “sound” in this context refers in particular to audible sound, that is to say sound which is audible to the human ear, in a frequency range of about 16 Hz to about 20 kHz. In the context of sanitary rooms the frequency range of about 500 Hz to 8 kHz is particularly relevant. Moreover, the sound is in particular an airborne sound, that is to say sound waves which are disseminated by air. The terms “sound reflection” and “sound absorption” likewise preferably refer to these frequency ranges. This is not intended to exclude that the sound reflection elements and the sound absorption elements alongside the above also may reflect or absorb sound in other frequency ranges, respectively. 
         [0011]    The at least one air-passage region has at least two layers of a plurality of sound reflection elements, that is to say a total of at least two sound reflection elements. Preferably, a plurality of sound reflection elements, that is to say at least two sound reflection elements, are provided in each layer. The sound reflection elements of one layer are preferably disposed in one common plane. The plurality of layers preferably run so as to be substantially parallel with one another. The at least two layers are mutually spaced apart in the thickness direction of the room delimitation element. The spacing between two layers which are adjacent in the thickness direction is preferably at least about 10 mm and/or at most about 20 mm, and the clear space between adjacent layers is preferably at least about 10 mm and/or at most about 15 mm, preferably about 11.5 mm, 12.0 mm, or 12.5 mm. 
         [0012]    The sound reflection elements of the different layers are disposed so as to be mutually offset in a direction (or a plurality of directions) which is/are transverse to the thickness direction of the room delimitation element. It is ensured in this way that the insert in the thickness direction of the room delimitation element has no rectilinear passage and the sound cannot make its way through the insert in an unobstructed manner. 
         [0013]    The sound reflection elements are arbitrary devices which are capable of at least partially reflecting sound in the desired frequency range. The sound reflection elements preferably have a sound transmission rate of up to 0% but may optionally also have sound absorbing properties alongside the sound reflecting properties. The sound reflection elements are preferably configured so as to be substantially plate-shaped. The sound reflection elements are preferably designed so as to be substantially planar, provided with structures, or configured with angular edges. The sound reflection elements are preferably made from a metallic or a plastics material. 
         [0014]    The sound absorption elements are arbitrary devices which are capable of at least partially absorbing sound in the desired frequency region. The (main) sound absorption effect of the sound absorption elements runs in a direction which is transverse to the thickness direction of the room delimitation element, preferably in that direction in which the sound absorption region lies beside the air-passage region. The sound absorption elements are preferably made from a material having sound absorbing properties and/or provided with a sound absorbing structure. The sound absorption elements are preferably made from a foamed material, preferably from a closed-cell rigid foam. Bores which run substantially in the direction of the desired sound absorption effect are preferably introduced in the sound absorption elements. 
         [0015]    In one preferred design embodiment of the invention at least one of the sound reflection elements in at least one layer is designed and/or disposed in such a manner that said sound reflection element deflects sound in a direction towards a sound absorption element of the at least one sound absorption region. 
         [0016]    In one preferred design embodiment of the invention at least one of the sound reflection elements in at least one layer is equipped with a further sound absorption element. The at least one further sound absorption element is preferably formed from an open-cell foam and is attached to a surface of a plate-shaped sound reflection element. 
         [0017]    In one further preferred design embodiment of the invention the sound absorption element/elements of the at least one sound absorption region are altogether designed in such a manner that they cause sound absorption in various frequency ranges. A total of a plurality of bores which are of various dimensions and in particular have various bore depths are preferably provided in the sound absorption elements. 
         [0018]    In one further preferred design embodiment of the invention the insert has at least one cover element which has a plurality of openings and in the thickness direction of the room delimitation element is disposed on one side of the at least two layers of sound reflection elements. Cover elements are preferably disposed on both sides of the at least two layers of sound reflection elements. The at least one cover element is preferably configured so as to be substantially plate-shaped, preferably designed as a grill element. The at least one cover element is preferably made from a metallic material, preferably from stainless steel. The at least one cover element preferably has sound reflecting properties. The at least one cover element preferably serves as an assembly element for fastening the layers of sound reflection elements and/or of the sound absorption elements and/or is used as a design element. 
         [0019]    The at least one cover element preferably protrudes beyond the through opening in at least one direction which is transverse to the thickness direction of the room delimitation element. The insert may be fastened to a wall of the room delimitation element, which adjoins the through opening, with the aid of the cover element in this way. 
         [0020]    The subject matter of the invention also includes an air-permeable insert for a through opening in an afore-described room delimitation element of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]    The above and further features and advantages of the invention will be better appreciated on account of the following description of preferred and non-limiting exemplary embodiments by means of the appended drawing, in which, to some extent schematically: 
           [0022]      FIG. 1  shows a perspective partial view of a toilet door according to the invention; 
           [0023]      FIG. 2A  shows a schematic diagram to visualize the air passage in the toilet door of  FIG. 1 ; 
           [0024]      FIG. 2B  shows a schematic diagram of sound absorption in the toilet door of  FIG. 1 ; 
           [0025]      FIG. 3  shows a front view of a toilet door according to a first exemplary embodiment of the invention; 
           [0026]      FIG. 3A  shows a sectional view of the toilet door of  FIG. 3 , according to section A-A; 
           [0027]      FIG. 3B  shows a sectional view of the toilet door of  FIG. 3 , according to section B-B; 
           [0028]      FIG. 4  shows a front view of a toilet door according to a second exemplary embodiment of the invention; 
           [0029]      FIG. 4A  shows a sectional view of the toilet door of  FIG. 4 , according to section A-A; and 
           [0030]      FIG. 4B  shows a sectional view of the toilet door of  FIG. 4 , according to section B-B. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0031]    Referring to  FIGS. 1, 2A, and 2B , the basic construction and the basic operating mode of a room delimitation element according to the invention will be explained in more detail first. The room delimitation element here will be explained by way of the example of a door for a sanitary room (a toilet door, for example), for a commercial aircraft, for example, without the invention being limited to this specific application. 
         [0032]    The room delimitation element  10  which is designed as a toilet door has a wall  12  which is configured as a door leaf and in which a through opening  14  is configured, preferably close to the floor. The through opening  14  has a substantially rectangular cross section, for example, and in the thickness direction  15  of the room delimitation element  10  extends through the entire room delimitation element  10 . 
         [0033]    An insert  16  which is designed according to the invention is inserted in this through opening  14 . The insert  16  on the one hand ensures an available cross section of about 200 cm 2 , for example, for an air passage, and on the other hand ensures sound absorption having a sound damping value of up to about 2 dB(A) and more for a relevant frequency range of about 500 Hz to 8 kHz. In this way, in particular flushing noises (from vacuum toilets, for example) cannot be perceived outside the sanitary room, or can be perceived only in a highly damped manner. 
         [0034]    For this purpose, the insert  16  has an air-passage region  18  which in the vertical direction above and below (generally in a direction which is transverse to the thickness direction  15  of the room delimitation element  10 ) is in each case adjoined by one sound absorption region  20 ,  22 . The air-passage region  18  of the insert here is preferably disposed completely within the through opening  14 , while the sound absorption regions  20 ,  22  are at least partially received in pocket-type clearances in the room delimitation element  10 , which are adjacent to the through opening  14 . The upper sound absorption region  20  here may be fixedly integrated in the room delimitation element  10 , for example, and the lower sound absorption region  22  may be removable for cleaning purposes and similar. The door leaf  12  adjoins the air-passage region  18  in each case in the horizontal direction, optionally by way of a buffer or the like therebetween. 
         [0035]    In the thickness direction  15  of the room delimitation element  10 , the insert  16  terminates in each case by way of a stainless-steel grill (layer thickness about 1 mm, for example) as the cover element  24 ,  26 . The cover elements  24 ,  26  have in each case a multiplicity of openings  25 ,  27 , so that a sufficiently large available cross section remains for the insert  16 . Size, shape, and distribution of the openings  25 ,  27  of the cover elements  24 ,  26  may be selected depending on the desired design. 
         [0036]    As is visualized in  FIGS. 2A and 2B , the air-passage region  18  has a first layer of sound reflection elements  182 ,  183 , and a second layer of sound reflection elements  184 . At least two layers of sound reflection elements are generally provided. 
         [0037]    The sound reflection elements  182 ,  183 ,  184  are from metal or plastics, for example, are designed so as to be substantially plate-shaped, and in each case extend in a plane which is transverse to the thickness direction  15  of the room delimitation element  10 . The sound reflection elements  182 ,  183 ,  184  have in each case a substantially planar surface, the sound reflection elements  183 ,  184  moreover having angular edges. 
         [0038]    The sound reflection elements  182 ,  183 , or  184 , respectively, within one layer are mutually spaced apart, so that openings remain between them. Moreover, the two layers of the sound reflection elements  182 ,  183 ,  184  are mutually spaced apart in the thickness direction  15  of the room delimitation element  10 , so that a vacant space of about 11 to 14 mm remains, for example. 
         [0039]    It is moreover evident in  FIGS. 2A and 2B  that the sound reflection elements  182 ,  183  of the first layer, and the sound reflection elements  184  of the second layer are mutually offset in the vertical direction and approximately mutually overlap, such that no rectilinear passage through the insert  16  exists in the thickness direction  15  of the room delimitation element  10 , at least not during interaction with the cover elements  24 ,  26 . 
         [0040]    The upper sound absorption region  20  has a sound absorption element  21  from a foam material, for example a closed-cell rigid foam. The sound absorption element  21  here directly adjoins the door leaf  12 , or is at least partially received in a clearance in the door leaf  12 , which adjoins the through opening  14 , respectively. One or more rows of bores  212 ,  214 ,  216  are introduced into the sound absorption element  21 . The rows of bores in each case extend so as to be transverse to the thickness direction  15  of the room delimitation element  10 , and in the thickness direction  15  of the room delimitation element  10  are provided behind one another. The bores  212 ,  214 ,  216  of the sound absorption element  21  of the upper sound absorption region  20  have in each case a bore depth (in the vertical direction) of about 90 mm The diameter of the bores  212 ,  214 ,  216  is about 5.5 mm, for example. 
         [0041]    In a similar manner, the lower sound absorption region  22  has a sound absorption element  23  from a foam material, for example a closed-cell rigid foam. The sound absorption element  23  here likewise directly adjoins the door leaf  12 , or is at least partially received in a clearance in the door leaf  12 , which adjoins the through opening  14 , respectively. One or more rows of bores  232 ,  234 ,  236  are introduced into the sound absorption element  23 , wherein the rows of bores in each case extend so as to be transverse to the thickness direction  15  of the room delimitation element  10 , and in the thickness direction  15  of the room delimitation element  10  are provided behind one another. The two outer bores  232 ,  236  of the sound absorption element  23  of the lower sound absorption region  22  have in each case a bore depth (in the vertical direction) of about 50 mm, and the inner bores  234  of the sound absorption element  23  of the lower sound absorption region  22  have in each case a bore depth (in the vertical direction) of about 30 mm. The diameter of the bores  232 ,  234 ,  236  is about 5.5 mm, for example. 
         [0042]    In the case of the sound absorption elements  21 ,  23  of the upper and of the lower sound absorption regions  20 ,  22  being designed with bores  212 ,  214 ,  216 ,  232 ,  234 ,  236  having various bore depths, sound of various frequencies may be absorbed in the sound absorption elements  21 ,  23 . 
         [0043]    Since the sound absorption elements  21 ,  23  are disposed outside the air-passage region  18  of the insert  16 , said sound absorption elements do not compromise the air passage. 
         [0044]    As is indicated in  FIGS. 2A and 2B , the sound reflection elements  184  may optionally additionally be coated with further sound absorption elements  19 , for example from an open-cell foam material. The sound reflection elements  182 ,  183  of the other layer may optionally also be equipped with further sound absorption elements. 
         [0045]    It is visualized in  FIG. 2A  that the insert  16  provides a sufficient available cross section in the through opening  14  of the room delimitation element  10 , such that sufficient air can flow therethrough. As is illustrated by the flow arrows  30 , the air in the region of the air-passage region  18  may flow through the openings  25 ,  27  in the two cover elements  24 ,  26 , and the vacant spaces between the sound reflection elements  182 ,  183 ,  184  of the two layers. The insert  16  may thus be used as an incoming air opening for the supply of external fresh air (right in  FIG. 2A ) into the interior (left in  FIG. 2A ) of a sanitary room without windows to the outside (which can be opened), such as in a commercial aircraft, for example. 
         [0046]    It is visualized in  FIG. 2B  that the insert  16  in the through opening  14  of the room delimitation element  10  ensures sufficient acoustic insulation, such that noises, such as flushing noises of a vacuum toilet in a sanitary room, for example, (left in  FIG. 2B ) do not make their way to the outside (right in  FIG. 2B ), or do so only in a damped manner. 
         [0047]    As is indicated by the sound wave arrows  32  in  FIG. 2B , part of the sound waves is already reflected at the cover element  24  on the inner side (left in  FIG. 2B ) of the room delimitation element  10 , and at the first layer of the sound reflection elements  182 ,  183 . Another part of the sound waves after multiple reflection between the reflection elements  182 ,  183 ,  184  of the two layers thus exits the cover element  26  on the outer side (right in  FIG. 2B ) of the room delimitation element  10  in an at least somewhat damped manner. A further proportion of the sound waves  32  ingressing the insert  16  is deflected by the sound reflection elements  182 ,  183 ,  184  in the air-passage region  18  in directions which are transverse to the thickness direction  15  of the room delimitation element  10 , here in particular upwards and downwards towards the sound absorption regions  20 ,  22 . The sound is then absorbed in the sound absorption regions  20 ,  22 , in the bores  212 ,  214 ,  216 , and  232 ,  234 ,  236  of the sound absorption elements  21 ,  23 . 
         [0048]    Referring to  FIGS. 3, 3A, and 3B , a specific first exemplary embodiment of a toilet door will be described as a room delimitation element of the invention. 
         [0049]    The construction of the insert  16  of this first exemplary embodiment substantially corresponds to the basic construction which has been explained by means of  FIGS. 2A and 2B . 
         [0050]    The insert has a first cover element  24  from stainless steel on the inner side of the room delimitation element  10  (left in  FIG. 3A , bottom in  FIG. 3B ), and a second cover element  26  from stainless steel on the outer side of the room delimitation element  10  (right in  FIG. 3A , top in  FIG. 3B ). These cover elements  24 ,  26  are provided with openings  25 ,  27  at least in the region of the air-passage region  18 , and are thus designed in a grill-type manner. The air-passage region  18  of the insert  16  in the vertical direction (upward/downward direction in  FIGS. 3 and 3A ) has a height of about 164 mm, for example. The cover elements  24 ,  26  protrude beyond the air-passage region  18  on all sides. 
         [0051]    The insert  16  in the air-passage region  18  has a first layer of sound reflection elements  182 ,  183  which are configured so as to be substantially plate-shaped, having a layer thickness of about 1 mm, for example, and are disposed behind the first cover element  24  so as to be spaced apart therefrom by about 2.5 mm and substantially parallel therewith. Furthermore, a second layer of sound reflection elements  164  which are likewise configured so as to be substantially plate-shaped, having a layer thickness of about 1 mm, for example, and are disposed behind the second cover element  26  so as to be spaced apart therefrom by about 2.5 mm and substantially parallel therewith. The sound reflection elements  182 ,  183  of the first layer in the vertical direction (upward/downward direction in  FIG. 3A ) are mutually spaced apart by about 23 mm, for example, and the sound reflection elements  184  of the second layer in the vertical direction (upward/downward direction in  FIG. 3A ) are mutually spaced apart by about 23 mm, for example, and are spaced apart from the sound absorption elements  21 ,  23  by about 11.5 mm, for example. 
         [0052]    On that side that faces the first layer of sound reflection elements  182 ,  183 , the sound reflection elements  184  of the second layer are provided or coated with further sound absorption elements  19  from an open-cell foam material, respectively. These further sound absorption elements  19  on the base have a layer thickness of about 3.5 mm, for example, and in the regions of the gaps between the sound reflection elements  182 ,  183  of the first layer have protrusions towards these gaps. In total, a vacant space having a width in the range of about 11.5 mm to 12.5 mm thus remains between the sound reflection elements  182 ,  183 ,  184  of the first and second layers. 
         [0053]    The upper sound absorption region  20  has a sound absorption element  21  from a closed-cell rigid foam, which is provided with three rows of bores  212 ,  214 ,  216 . The diameter of the bores  212 ,  214 ,  216  is in each case about 5.5 mm, for example, and the bore depth of the bores  212 ,  214 ,  216  is in each case about 90 mm, for example. 
         [0054]    The lower sound absorption region  22  has a sound absorption element  23  from a closed-cell rigid foam, which is provided with three rows of bores  232 ,  234 ,  236 . The diameter of the bores  232 ,  234 ,  236  is in each case about 5.5 mm, for example, the bore depth of the outer bores  232 ,  236  is in each case about 50 mm, for example, and the bore depth of the inner bores  234  is in each case about 32 mm. 
         [0055]    While the air-passage region  18  of the insert  16  at the top and at the bottom adjoins in each case a sound absorption region  20  or  22 , respectively, which in turn adjoins the door leaf  12  of the room delimitation element  10 , as can be seen in  FIG. 3A , the air-passage region  18  laterally by way of a buffer element  28  of a layer thickness of about 2 mm, for example, (directly, that is to say without interdisposed sound absorption regions) adjoins the door leaf  12 , as can be seen in  FIG. 3B . Plug pieces  29 , by way of which the sound reflection elements  182 ,  184  are held in their respective positions are moreover provided in this lateral region. 
         [0056]    Referring to  FIGS. 4, 4A, and 4B , a specific second exemplary embodiment of a toilet door as a room delimitation element of the invention will now be described. 
         [0057]    Same or equivalent components are identified with the same reference numerals as in the first exemplary embodiment of  FIGS. 3, 3A, and 3B . In the following, the differences in relation to the first exemplary embodiment above will be described in particular. 
         [0058]    As opposed to the first exemplary embodiment, a total of three layers of sound reflection elements are disposed in the air-passage region  18  of the insert  16  of this exemplary embodiment. In order for the larger layer thickness of the insert  16  to thus be received in the air-passage region  18 , the cover element  24  is placed on the inner side of the room delimitation element  10  (left in  FIG. 4A , bottom in  FIG. 4B ) as an attachment onto the door leaf  12 , having a spacing of about 10 mm, for example, and is preferably dimensionally stabilized using ribs (cf.  FIG. 4B ). 
         [0059]    The first layer of sound reflection elements  182 ,  183  is configured so as to be substantially plate-shaped, having a layer thickness of about 1 mm, for example, and is disposed behind the first cover element  24  so as to be spaced apart therefrom by about 2.7 mm and substantially parallel therewith. The second layer of sound reflection elements  186  is configured so as to be substantially plate-shaped, having a layer thickness of about 1 mm, for example, and is disposed behind the second cover element  26  so as to be spaced apart therefrom by about 2.7 mm and substantially parallel therewith. The additional middle layer of sound reflection elements  185  is likewise configured so as to be substantially plate-shaped, having a layer thickness of about 1 mm, for example, and is disposed so as to be substantially centric between the first and the second layer and substantially parallel therewith. The sound reflection elements  185  of the middle layer are in each case spaced apart from the sound reflection elements  182 ,  183 ,  186  of the first and of the second layer by about 11.6 mm, for example. 
         [0060]    As opposed to the first exemplary embodiment described above, in this second exemplary embodiment no sound reflection elements in the air-passage region  18  are equipped with any kind of further sound absorption elements  19 . However, this is possible in principle also in the variant of embodiment of  FIGS. 4, 4A, and 4B . 
         [0061]    On account of having disposed a total of three layers of sound reflection elements, the effect of multiple reflection of the sound impacting on the insert  16  is reinforced. Therefore, sufficiently high sound damping can be achieved even without further sound absorption elements  19  in the region of the air-passage region  18 . 
         [0062]    In other aspects, the insert of this second exemplary embodiment corresponds to that of the first exemplary embodiment described above. 
         [0063]    In both exemplary embodiments of  FIGS. 3 to 4B , the sound absorption elements  21 ,  23  may optionally be integrated with the air-passage region  18 , so as to form a constructive unit, such that this constructive unit as a whole may be installed in the through opening  14  in the room delimitation element  10 . Alternatively, the air-passage region  18  and the sound absorption regions  20 ,  22  may also be provided as separate components and successively assembled in the through opening. In both variants, the sound absorption elements  21 ,  23  of the sound absorption regions  20 ,  20  may be inlaid and/or adhesively bonded into the adjoining door leaf  12 , for example. 
         [0064]    While in each case one upper and one lower sound absorption region  20 ,  22  have been provided for the insert  16  in the above exemplary embodiments, it is also possible in the context of the invention for only one sound absorption region to be provided in a manner adjoining the air-passage region  18 , for the sound absorption region/s to be disposed laterally beside the air-passage region  18 , for more than one air-passage region  18  to be provided, and so forth. Also, the cross-sectional shapes of the air-passage region  18  and of the entire insert  16  are not to be limited to the rectangular shapes of the exemplary embodiments described above.