Weatherproof hood for guiding an airflow along an exterior wall section

Abstract

The invention relates to a weather protection hood (100) for guiding an airflow (102) through a wall penetration (108) on an outer wall section (104) of a building wall (106), comprising a frame part (110) for mounting the weather protection hood (100) on the wall section (104), wherein the frame part (110) has at least one opening (114, 114') which corresponds to the wall penetration (108) in an air-guiding manner, and a hood part (112) which can be arranged on the frame part (110) and is configured to cover an outer wall area of ​​the wall penetration (108), wherein the frame part (110) and the hood part (112) define an airflow path (118) for the exhaust airflow (102). A flow guidance contour (120) is provided on the airflow path (118) of the weather protection hood (100), which is designed to direct the airflow (102) leaving the airflow path (118) away from the adjacent wall section (104).

Description

[0001] The invention relates to a weather protection hood for discharging an air flow to be led out through a wall duct on an outside wall section of a building wall, comprising a frame part for mounting the weather protection hood on the wall section, wherein the frame part has at least one opening which corresponds to the wall duct in an air-conducting manner, and a hood part which can be arranged on the frame part and is designed to cover the outlet region of the wall duct, wherein the frame part and the hood part define an air flow path for the exhaust air flow.

[0002] Weather protection hoods for directing an air flow are combined with wall ducts of ventilation devices, such as extractor hoods, wet room ventilators or residential ventilation devices, and are mounted in particular on the outside wall section of a building wall. The weather protection hood covers the outside wall section of the wall duct and guides the air flow that is supplied to or discharged from the wall duct. In particular, an air flow that is discharged from the wall duct, a so-called exhaust air flow, is directed out of the weather protection hood in a preferred direction relative to the building wall. With conventional weather protection hoods, the air flow is often redirected upon or after leaving the wall duct and directed downwards near the building wall, out of the air flow path defined by the frame section and hood section.Known weather protection hoods have at least one frame part for mounting the weather protection hood on the wall section and a hood part which is attached to it after the frame part has been mounted.

[0003] The airflow directed out of the weather protection hood, especially the exhaust airflow, often carries a high moisture content, which can lead to the formation or deposition of condensate, particularly in cold temperatures, in the area of ​​the weather protection hood and the wall area extending below the weather protection hood. The moisture settling on the surface of the exterior wall section provides a perfect habitat for fungi, algae, or other microorganisms, which then cause contamination of the building wall around the airflow path of the weather protection hood.

[0004] The state of the art attempts to keep condensate forming directly on the weather protection hood away from the exterior wall section of the building wall. For example, CN 218 033 289 U, JP 2002 130757 A, and KR 101 783 547 B1 propose providing a type of drip tray below the air flow path of the weather protection hood to drain the accumulating condensate away from the wall. At the very least, direct contact of condensate forming on the weather protection hood with the wall section below is avoided. However, an exhaust air stream containing the moisture passing through the air flow path of the weather protection hood continues to flow along the building wall, causing moisture to settle on it.Under certain circumstances, the drip trays cause the discharged air flow to flow back, so that an air flow escaping from the weather protection hood comes into increased contact with the wall section below, thus resulting in increased moisture deposition from the air flow onto the wall section.

[0005] The invention was therefore based on the object of demonstrating a weather protection hood of the type described above, by means of which the deposition of condensate as a whole and possible resulting contamination on the building wall below the weather protection hood is reduced or, at best, avoided.

[0006] The invention solves the underlying problem according to a weather protection hood for guiding an air flow, which has a frame part for mounting the weather protection hood on the wall section and a hood part for covering the outlet area on the wall duct, with the features of claim 1. In particular, a flow guide contour is provided on the air flow path of the weather protection hood, which flow guide contour is designed to guide the air flow leaving the air flow path of the weather protection hood away from the adjacent wall section in a defined manner.

[0007] The invention is therefore based on the finding that instead of "merely" providing a drip tray behind the air flow path on the weather protection hood, by means of which condensate forming on the weather protection hood is kept away from the adjacent wall section, a flow guide contour is now provided or formed, preferably directly on the air flow path of the weather protection hood, which defines an air flow path on the weather protection hood for an exhaust air flow. By means of the flow guide contour, the air flow is additionally deflected in such a way that it is specifically directed away from the wall section adjacent to the weather protection hood. By means of the weather protection hood according to the invention, the air flow is discharged away from the wall, preferably without it coming into contact with the outside wall section. The flow guide contour according to the invention preferably fulfills a dual function.By keeping condensate away and diverting the airflow, preferably the exhaust airflow, the contact of the wall section adjacent to the airflow path of the weather protection hood with moisture is significantly reduced compared to prior art solutions, thus counteracting the formation of fungi, algae, or microorganisms on the wall section and thus the formation of dirt in this area. The airflow path of the weather protection hood, defined by the frame section and hood section and formed as an airflow path, extends approximately perpendicular to the exterior wall section of the building wall.

[0008] According to a preferred development of the weather protection hood, the flow guide contour is arranged in the region of a lower edge of the frame part and projects approximately perpendicularly in the direction of the hood part. By arranging the flow guide contour preferably on the lower edge of the frame part, from which the flow guide contour preferably projects approximately perpendicularly in the direction of the hood part, an efficient deflection of the exhaust air flow leaving the air flow path at the weather protection hood is achieved. In particular, the flow guide contour deflects the flow in a direction that is oriented at an angle of at least 30° to the wall section. Preferably, the flow is deflected in a direction normal to the wall, i.e. preferably perpendicular to the wall section.The removal of the escaping, particularly moist, exhaust air flow from the wall section, as well as the dripping of potentially accumulating condensate on the weather protection hood, has been further improved. The efficient redirection of the exhaust air flow by means of the flow guide contour counteracts the recirculation of the exhaust air flow, i.e., the creation of a turbulence zone with partially backflowing exhaust air flow components, particularly directly at the air flow path of the weather protection hood.

[0009] A preferred development of the invention provides that the flow guide contour has a flow guide body that at least partially blocks the air flow path and has a deflection surface with a preferably three-dimensionally shaped surface for the exhaust air flow. Arranging a flow guide body in the air flow path of the weather protection hood, by means of which the air flow path, in particular the outlet cross-section, of the weather protection hood is at least partially blocked, represents a structurally simple possibility for forming a flow guide contour that deflects the exhaust air flow and diverts the exhaust air flow as it exits the air flow path. The flow guide body has a deflection surface with a preferably three-dimensionally shaped surface for the exhaust air flow.In contrast to prior art drip trays, the deflection surface has an unevenly shaped surface with elevations and depressions, causing the exhaust air flow to leave the air flow path of the weather protection hood at varying flow velocities. The deflection surface, preferably its surface, has an irregularly shaped surface across its width and length. The elevations and depressions on the deflection surface result in a targeted deflection of the discharged air flow, preferably the exhaust air flow, across the width of the weather protection hood. The width of the deflection surface in this case refers to the extent of the deflection surface in a direction parallel to the wall section. The length of the deflection surface refers to its extent in a direction approximately perpendicular to the wall section. The width of the deflection surface runs essentially perpendicular to the length of the deflection surface.

[0010] In addition to a preferably three-dimensionally shaped surface, the deflection surface also has a separation edge, which is preferably located exactly within the outlet cross-section on the weather protection hood. Its shape is particularly adapted to the design of the three-dimensionally shaped surface. In particular, the separation edge on the flow guide body has a curved shape along its length.

[0011] According to a preferred embodiment of the invention, the flow guide body has a central segment which is at least partially directly adjacent to the opening in the frame part or is arranged offset from the opening in the frame part and terminates at a separation edge of the guide body, which central segment preferably has a convex, in particular curved, outer contour. With the help of the central segment formed on the deflection surface, a comparatively voluminous central part of the guide body is formed, with which an increase in the flow velocity of the air flow, preferably of the exhaust air flow, is achieved, preferably immediately in front of the outlet cross-section on the weather protection hood. The central segment is designed in particular to reduce the recirculation area of ​​the exhaust air flow in the flow direction behind the flow guide contour. In the context of the present invention, the term “convex” always refers to the curvature orCurvature of the deflection surface or of sub-segments thereof on the guide body itself. The central segment on the flow body has an outwardly curved outer contour, which correspondingly reduces the outflow cross-section at the weather protection hood.

[0012] According to a preferred embodiment, the central segment has a longitudinal axis extending approximately parallel to a lower edge of the frame part, wherein the central segment has a constant or changing cross-section in the direction of the longitudinal axis. Preferably, the central segment has an outer contour which, in conjunction with the convex outer contour on the central segment, has a cross-section in the direction of the longitudinal axis that approximately corresponds to a quarter circle or a quarter ellipse. The particularly convex outer contour on the central segment also creates a smooth transition from the frame part located upstream to the central segment, with its opening, and towards the downstream separation edge.

[0013] In one possible embodiment of the weather protection hood, the cross-section of the central segment decreases towards both ends of the central segment. This ensures optimal flow control of the exhaust air flow emerging at the opening in the frame part and deflected downwards by the hood part interacting with the frame part. The central segment, which tapers towards both ends along its longitudinal axis, preferably has a barrel-like or barrel-like shape. In one possible embodiment, the central segment preferably has an approximately linear transition adjacent to the opening in the adjacent frame part. The cross-sectional reduction preferably forms in the direction of the separation edge on the flow guide body. In a preferred embodiment, the central segment has end surfaces at its ends that run essentially parallel to the sides of the frame part.

[0014] In a further development of the invention, the flow guide body has two outer deflection regions delimited by the sides of the frame part, each having a guide surface that is at least partially concave. With the aid of the deflection regions on both sides of the frame part, with their preferably concave guide surfaces in the area of ​​the flow guide body close to the wall, a portion of the exhaust air flow guided along the sides of the frame part is effectively redirected to the center of the exiting exhaust air flow, in particular in the direction of the central segment. The guide surface has approximately the contour of a partial segment of a spherical shell, creating a surface on the guide surface that is uniformly curved inward relative to the flow body, the radius of which is at least 10 mm and at most approximately 100 mm.

[0015] In one design, a ramp-like contour is formed on the deflection surface on both sides of the central segment, which imparts a flow direction to the exhaust air stream, preferably approximately normal to the wall section, i.e., perpendicular to the wall section. In addition to reliably redirecting the exhaust air stream, this also ensures that condensate forming on the weather protection hood drips away from the wall. Any condensate forming on the flow guide body is carried along with the exhaust air stream deflected away from the wall section.

[0016] A preferred embodiment of the invention proposes that a convex-shaped guide surface adjoins the concave-shaped guide surface, wherein the guide surfaces, together with a separation edge delimiting the length of the flow guide body, preferably taper to a point on the sides of the guide body. The flow guide body has a length that corresponds approximately to half the length of the air flow path, particularly in the region of any side walls of the hood part that laterally delimit the air flow path of the weather protection hood, which is designed as the outlet region. This deflects the exhaust air flow from the side regions on the air flow path of the weather protection hood towards the center of the exhaust air flow near the central segment. This causes an increased proportion of the exhaust air flow to move through the outlet cross-section of the weather protection hood at an increased flow velocity.The transition from the concave to the convex shaped guide surface of the flow body preferably occurs smoothly, without any abrupt contour changes, which promotes the efficient deflection of the exhaust air flow. Preferably, the lateral deflection areas of the flow guide body taper towards a separation edge or the flow guide body's trailing edge, which again has a concave shaped outflow surface.

[0017] In a further embodiment of the weather protection hood, the flow guide body has a connecting region that tapers from the deflection region towards the central segment and has a wedge-shaped cross-section relative to the longitudinal axis of the central segment. In a preferred embodiment, the connecting region has the cross-section of a triangle, wherein in particular the length of the leg, which preferably extends perpendicular to the frame part, varies only slightly or remains constant. The height of the wedge-shaped cross-section preferably changes, preferably decreases, at the connecting region in the direction of the central segment. The connecting region can be linear or curved, in particular convexly curved, in its connection to the adjacent surface on the frame part.

[0018] A possible further development of the weather protection hood provides for a sudden change in cross-section between the central segment and the directly adjacent connecting area. The connecting areas on both sides of the central segment each abut directly against an end face of the central segment. In a preferred embodiment, each end face of the central segment has two linear legs, preferably of equal length, through the adjacent connecting area, which enclose an angle greater than 90°. One leg is delimited by the end face and the adjacent surface of the frame part, and the other leg is delimited by the end face on the central segment and the adjacent surface of the connecting area. In one possible embodiment, the leg lengths at the end faces of the central segment are of different lengths.

[0019] The flow guide body preferably has a separation edge with a curved profile along the separation edge. In contrast to the drain surfaces known from the prior art with a straight separation edge, the flow guide body has a separation edge that has a curved profile in its direction of extension. In particular, the separation edge has a convexly curved central region defined by the central segment. On both sides of the central region, there is a concavely curved end region that extends to the pointed guide surfaces of a respective deflection region. The separation edge preferably has at least three main curves with two transitions with alternating gradients. The separation edge preferably runs at the level of the lower edge of the frame part, which defines a lower wall surface of the flow guide body extending in a plane from the lower edge of the frame part.Preferably, the concavely curved tear-off edge is located within the outlet cross-section of the weather protection hood.

[0020] The separation edge on the flow guide body is preferably designed in a stepped manner, which improves the separation of the exhaust air flow flowing directly along the deflection surface and ensures a preferably undisturbed discharge of the exhaust air flow away from the wall section of the building wall.

[0021] In a preferred embodiment of the weather protection hood, the flow guide body is formed integrally with the frame part. The one-piece design of the flow guide body on the frame part allows for simplified production of the frame part and flow guide body together. Furthermore, the one-piece design between the guide body and the frame part creates a structurally sound connection between the frame part and the flow guide body. In one possible embodiment, the flow guide body can be formed separately from the frame part, whereby it can be attached to the frame part or directly to the wall section during installation at the wall penetration of the building wall.

[0022] In one possible embodiment of the weather protection hood, the flow guide body has a flat lower wall surface extending at an angle of at least 90° or greater to the frame part. The lower wall surface is preferably flush with the lower edge of the frame part of the flow guide body. Furthermore, the lower wall surface is preferably flat, which, in conjunction with the curved separation edge of the guide body, achieves a preferably turbulence-free separation of the exhaust air flow from the flow guide contour. This further improves the removal of the exhaust air flow away from the wall, and recirculation of the discharged air flow and contact of moisture entrained with the air flow with the wall section are avoided.

[0023] A possible development of the invention provides that the frame part has one or more brackets and / or mounting points for receiving fastening means that can be brought into operative connection with the frame part or an auxiliary mounting structure. Preferably, the frame part is fastened to the external wall section of the building wall in the region of the wall feedthrough using suitable fastening means such as screws or clamps. For this purpose, at least one, preferably several brackets or mounting points are provided on the frame part. In one possible embodiment, the frame part has brackets and / or mounting points that are designed to interact with an auxiliary mounting structure. Preferably, the at least one auxiliary mounting structure, which is formed separately from the frame part, is mounted on the external wall section in the region of the wall feedthrough.The frame part can be connected to the assembly auxiliary structure by means of form-fitting, whereby the frame part and the assembly auxiliary structure can have corresponding locking parts.

[0024] According to one possible embodiment of the weather protection hood, the opening in the frame part has a cross-section selected from the group: round, oval, substantially rectangular, and a combination of these. The opening in the frame part preferably has a cross-section that is adapted, in particular, to the cross-section of a ventilation duct led through the wall duct. In a preferred embodiment, the opening has a circular cross-section. In a further embodiment, the opening has a substantially rectangular cross-section with rounded corners. In the case of a rectangular cross-section, a preferred embodiment provides that the lower reveal surface closest to the flow body ends with the upper section of the central segment. With the circular design of the opening, at least the lower circular segment of the reveal surface in the central region ends with the upper end of the central segment.

[0025] A further development of the weather protection hood according to the invention provides that the hood part has a baffle wall running at an acute angle to the frame part and two side walls stiffening the baffle wall, wherein the hood part is preferably connected to the frame part by means of a force, form and / or material connection. By means of the baffle wall, which preferably completely covers the free cross-section of the opening in the frame part, effective weather protection is achieved so that rainwater cannot penetrate into the wall opening. The upper end of the baffle wall of the hood part lies directly against the upper end of the frame part. The baffle wall runs diagonally downwards from the upper end of the frame part, wherein the baffle wall of the hood part is supported laterally on the frame part by two side walls running essentially at right angles to the baffle wall. The baffle wall and side walls of the hood part preferably cover the frame part over its entire height.The lower end of the baffle and the two side walls preferably terminates with the flow guide contour, which preferably protrudes vertically from the lower edge of the frame part. The inner sides of the baffle and side walls, as well as the flow guide contour, limit and define the air flow path, in particular the outlet opening on the weather protection hood. The hood part and frame part are preferably screwed, clamped, pushed onto one another, or firmly bonded using a suitable connecting material, such as an adhesive.

[0026] The invention is described in more detail below using a preferred embodiment with reference to the accompanying figures. Fig. 1: a perspective view of an embodiment of a weather protection hood according to the invention, mounted on an outside wall section; Fig. 2: a view of a frame part according to the invention with a flow guide contour formed thereon; Fig. 3: a view of an alternative embodiment of a frame part according to the invention with its flow guide contour, and Fig. 4: an enlarged detail view of detail II from Fig. 2.

[0027] Fig. 1 shows a weather protection hood 100 for supplying and / or discharging an air flow 102 which is directed along an outside wall section 104 of a building wall 106 toward or away from a wall duct 108 in the building wall 106.

[0028] The weather protection hood 100 has a frame part 110 for mounting the weather protection hood 100 on the wall section 104. The weather protection hood 100 further comprises a hood part 112, which can be arranged on the frame part 110 and is designed to cover the exit area of ​​the wall duct 108. In addition, the hood part 112 can be used to seal against the outside wall section 104. The frame part 110 has at least one opening 114 ( Fig. 2), which corresponds in particular to an exhaust air duct 116 arranged within the wall duct 108.

[0029] How Fig. As further illustrated in Figure 1, the frame part 110 and the hood part 112 define an air flow path 118 for the air flow 102, which extends approximately perpendicular to the wall section 104. The hood part 112 has at least one baffle 146 extending at an acute angle to the frame part 110 and two side walls 148 that laterally stiffen the baffle 146. The hood part 112 is connected to the frame part 110 in a force-fitting, form-fitting, and / or material-fitting manner.

[0030] For fastening the frame part 110 to the wall section 104, the frame part 110 has one or more brackets and / or mounting points (not shown in detail) for receiving fastening means that can be brought into operative connection with the frame part 104 or an auxiliary mounting structure.

[0031] According to the present invention, a flow guide contour 120 is provided on the air flow path 118 of the weather protection hood 100, by means of which the air flow 102, preferably an exhaust air flow leaving the air flow path 118, is guided away from the adjacent wall section 104.

[0032] In a preferred embodiment, the flow guide contour 120 is configured to direct the discharged air flow 102 at an angle of at least 30° to the wall section 104. Moisture carried by such an exhaust air flow 102 thus does not come into contact with the wall section 104 arranged adjacent to the air flow path 118 of the weather protection hood 100.

[0033] The flow guide contour 120 is arranged in the region of a lower edge 122 of the frame part 110. In one possible embodiment, the flow guide contour 120 protrudes approximately perpendicularly from the frame part 110 in the direction of the hood part 112.

[0034] How Fig. 2, the flow guide contour 120 has a flow guide body 124 which defines the air flow path 118 ( Fig. 1) on the weather protection hood 100 is at least partially blocked. In particular, the flow guide body 124 has a deflection surface 126 with a particularly three-dimensionally shaped surface for the exhaust air flow 102 flowing along it. With the aid of the three-dimensionally shaped surface of the deflection surface 126, regions of the exhaust air flow 102 are deflected and preferably accelerated in such a way that recirculation of the exhaust air flow behind the flow guide contour 120 is counteracted and thus contact of moisture with the wall section 104 arranged below the air flow path is reduced or, at best, avoided.

[0035] As from Fig. 2, the opening 114 has a cross-section that is essentially rectangular and rounded in the corner areas. Fig. Figure 3 shows an alternative embodiment of the frame part 110 with an opening 114' that has a circular cross-section. A frame part 110 equipped with a circular opening 114' then corresponds to a cylindrical exhaust air duct (not shown in detail) extending through the wall duct 108.

[0036] All of the configurations described below for the flow guide contour 120 or the flow guide body 124 refer to both in the Fig. 2 and Fig. 3, regardless of the design of the opening 114 on the frame part 108. The flow guide contour 120 / the flow guide body 124 has, on its deflection surface 126, a central segment 128 with a convexly shaped, in particular convexly curved, outer contour 130. In one embodiment, the central segment 128 adjoins, at least in some areas, directly to a respective opening 114, 114' of the frame part 110, but can also be arranged offset, in particular downwards, from the opening 114, 114' on the frame part 110.

[0037] In the Fig. 2 and Fig. 3, a reveal surface 132 defining the opening 114 merges seamlessly into the downstream central segment 128. The central segment 128 has a longitudinal axis L ( Fig. 1). In a preferred embodiment, the lower edge 122 and the longitudinal axis L coincide. The central segment 128 has a cross-section, relative to its longitudinal axis L, that corresponds approximately to a quarter circle or a quarter ellipse. The cross-section of the central segment 128 decreases, in particular, toward its two lateral end surfaces 134. The central segment 128 has, in particular, a barrel-shaped or barrel-shaped outer contour.

[0038] The flow guide body 124 further comprises an outer deflection region 136 on each side of the frame part 104, which has a concavely shaped guide surface 138. With the aid of the guide surface 138, the lateral partial flows of the exhaust air flow 102 are deflected toward the central region on the air flow path 118.

[0039] In one possible embodiment, the concavely shaped guide surfaces 138 are each adjoined by an oppositely shaped, convex guide surface 140. The guide surfaces 140 converge and taper at the sides of the guide body 124 with a separation edge 142 that delimits the flow guide body 120 in the air flow path 118. The lateral deflection regions 136 converge in the direction of the separation edge 142 on the flow guide body 124 with a concavely shaped outflow surface 140.

[0040] In the central region of the flow guide body 120, the contour of the separation edge 142 is defined by the barrel-shaped central segment 128, with the separation edge 142 having a convexly curved section 144 in its central region. The convexly curved section 144 of the separation edge 142 merges on both sides into a section 144' with at least one concave profile.

[0041] The flow guide body 124 has a connecting region 150 between the deflection region 136 and the central segment 128 with a wedge-shaped cross-section relative to the longitudinal axis L of the central segment 128. The connecting regions 150 on both sides of the central segment 128 each decrease in cross-section from the deflection region 136 toward the central segment 128.

[0042] From the central segment 128 to the directly adjacent connecting areas 150, a sudden cross-sectional change in the form of the end surfaces 134 is provided on the central segment 128. The end surfaces 134 face away from each other and delimit the central segment 128 at each end in the direction of extension of the longitudinal axis L. The end surfaces 134 run approximately parallel to the sides of the frame part 110.

[0043] In the embodiment shown here, the flow guide body 124 is formed integrally with the frame part 110. As further shown in Fig. 1, the flow guide body 124 has a flat lower wall surface 152 running substantially perpendicular to the frame part 110.

[0044] Fig. 4 shows an enlarged version of detail II from Fig. 2, which shows the design of the tear-off edge 142. How Fig. As shown in Figure 4, the separation edge 142 is stepped. Each section 144, 144' of the separation edge 142 or region of the flow guide body 124 has a shoulder 154 projecting into the air flow path 118 on the weather protection hood 110, thereby further improving the outflow behavior of the air flow 102, designed as an exhaust air flow, at the weather protection hood 100. Furthermore, a defined dripping of accumulating condensate away from the wall is achieved. List of reference symbols: 100 weather protection cover 102 Exhaust air flow 104 wall section 106 building wall 108 Wall duct 110 frame part 112 Hood part 114, 114' Breakthrough 116 Exhaust air duct 118 Air flow path 120 Flow guide contour 122 bottom edge 124 flow guide bodies 126 Deflection surface 128 middle segment 130 outer contour 132 reveal area 134 End face 136 Deflection area 138, 138' control surface 140 outflow area 142 tear-off edge 144, 144' section tear-off edge 146 impact wall 148 side wall 150 connection area 152 wall area 154 paragraph L Longitudinal axis QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] CN 218 033 289 U

[0004] JP 2002 130757 A

[0004] KR 101 783 547 B1

[0004]

Claims

[1] Weather protection hood (100) for guiding an air flow (102) to be guided through a wall duct (108) on an outside wall section (104) of a building wall (106), with a frame part (110) for mounting the weather protection hood (100) on the wall section (104), wherein the frame part (110) has at least one opening (114, 114') which corresponds to the wall duct (108) in an air-conducting manner, and a hood part (112) which can be arranged on the frame part (110) and is designed to cover an area of ​​the wall duct (108) on the outside of the wall, wherein the frame part (110) and the hood part (112) define an air flow path (118) for the air flow (102), characterized bythat a flow guide contour (120) is provided on the air flow path (118) of the weather protection hood (100), which is designed to guide the air flow (102) leaving the air flow path (118) away from the adjacent wall section (104). [2] Weather protection hood (100) according to claim 1, characterized by that the flow guide contour (120) is arranged in the region of a lower edge (122) of the frame part (110) and projects approximately perpendicularly in the direction of the hood part (112). [3] Weather protection hood (100) according to claim 1 or 2, characterized by in that the flow guide contour (120) has a flow guide body (124) which at least partially blocks the air flow path (118) and has a deflection surface (126) with a preferably three-dimensionally shaped surface for the exhaust air flow (102). [4] Weather protection hood (100) according to claim 2 or 3, characterized bythat the flow guide body (124) has a central segment (128) which is at least partially directly adjacent to the opening (114, 114') of the frame part (110) or arranged offset from the opening (114, 114') of the frame part (110) and which terminates at a tear-off edge (142) of the guide body (124), which central segment preferably has a convex-shaped, in particular curved, outer contour (130). [5] Weather protection hood (100) according to claim 4, characterized by that the central segment (128) has a longitudinal axis (L) extending approximately parallel to a lower edge (122) of the frame part (110), wherein the central segment (128) has a changing cross-section in the direction of the longitudinal axis (L). [6] Weather protection hood (100) according to claim 4 or 5, characterized by that the cross-section of the middle segment (128) decreases towards both ends of the middle segment. [7] Weather protection hood (100) according to one of claims 2 to 6, characterized by that the flow guide body (124) has two outer deflection regions (136) delimited by the sides of the frame part (110) with a guide surface (138) which is at least partially concave. [8] Weather protection hood (100) according to claim 7, characterized by that the concavely shaped guide surface (138) is followed by a convexly shaped guide surface (138'), wherein preferably the guide surfaces (138') together with the separation edge (142) taper to a point on the sides of the guide body (124). [9] Weather protection hood (100) according to one of claims 2 to 8, characterized by that the flow guide body (124) has a connecting region (150) tapering from the deflection region (136) in the direction of the central segment (128) and having a wedge-shaped cross-section relative to the longitudinal axis of the central segment (128). [10] Weather protection hood (100) according to claim 9, characterized bythat a sudden change in cross-section is formed between the central segment (128) and the directly adjacent connecting region (150). [11] Weather protection hood (100) according to one of claims 2 to 10, characterized by that the flow guide body (124) has a separation edge (142) with a curved course along the separation edge, wherein the separation edge (142) is preferably stepped. [12] Weather protection hood (100) according to one of claims 2 to 11, characterized by that the flow guide body (124) is formed in one piece with the frame part (110) and / or has a flat lower wall surface (152) running substantially perpendicular to the frame part (110). [13] Weather protection hood (100) according to one of claims 1 to 12, characterized bythat the frame part (110) has one or more holders and / or mounting points for receiving fastening means or an auxiliary mounting structure that can be brought into operative connection with the frame part (110). [14] Weather protection hood (100) according to one of claims 1 to 13, characterized by that the opening (114, 114') on the frame part (110) has a cross-section selected from the group: round, oval, substantially rectangular, and combinations thereof. [15] Weather protection hood (100) according to one of claims 1 to 14, characterized by that the hood part (112) has a baffle wall (146) running at an acute angle to the frame part (110) and two side walls (148) stiffening the baffle wall (146), wherein the hood part (112) is preferably connected to the frame part (110) by means of a force, form and / or material connection.

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