A window device comprising: - a window, - window frame, which is a separate part for being fixedly connected to a wall, - a window holder element, to which the window is attached along a periphery of the window, - a window-motion dampening element, and - a coupling device via which the window holder element is in engagement with the window frame, wherein - the dampening element is arranged between window holder element and the window frame and is arranged to be compressed and deformed by the window holder element upon motion of the window and the window holder element in a first direction, which is perpendicular to the main extension plane of the window, wherein - the coupling device comprises a guide recess arranged in a first of an inner periphery of the window frame and the window holder element, said guide recess being elongated and extending in its longitudinal direction in said first direction, and a projection attached to a second of said inner periphery of the window frame and the window holder element, wherein the projection extends into the guide recess and is able of sliding in the guide recess in said first direction or a second direction opposite to the first direction, - and wherein in a normal operation position of the window in which the dampening element is not compressed and is positioned between the window holder element and the window frame, the projection of the coupling device is located at a first end of the guide recess, such that motion of the window holder element in the second direction is prevented but motion of the window holder element in the first direction is allowed by the coupling device, said window device being characterised in that, the window holder element has a first leg and a second leg that render the window holder element an L-shaped cross-section, - the first leg of the L-shaped window holder element extends along and opposite to an inner periphery of the window frame, wherein one of said guide recess and said projection is arranged in or attached to said first leg, - the second leg of the L-shaped window holder element extends along and opposite to a front side of the window frame, and wherein - the dampening element is arranged between the second leg of the L-shaped window holder element and the front side of the window frame and is arranged to be compressed and deformed by the second leg of the window holder element upon motion of the window and the window holder element in said first direction. - a window, - window frame, which is a separate part for being fixedly connected to a wall, - a window holder element, to which the window is attached along a periphery of the window, - a window-motion dampening element, and - a coupling device via which the window holder element is in engagement with the window frame, wherein - the dampening element is arranged between window holder element and the window frame and is arranged to be compressed and deformed by the window holder element upon motion of the window and the window holder element in a first direction, which is perpendicular to the main extension plane of the window, wherein - the coupling device comprises a guide recess arranged in a first of an inner periphery of the window frame and the window holder element, said guide recess being elongated and extending in its longitudinal direction in said first direction, and a projection attached to a second of said inner periphery of the window frame and the window holder element, wherein the projection extends into the guide recess and is able of sliding in the guide recess in said first direction or a second direction opposite to the first direction, - and wherein in a normal operation position of the window in which the dampening element is not compressed and is positioned between the window holder element and the window frame, the projection of the coupling device is located at a first end of the guide recess, such that motion of the window holder element in the second direction is prevented but motion of the window holder element in the first direction is allowed by the coupling device, said window device being characterised in that, the window holder element has a first leg and a second leg that render the window holder element an L-shaped cross-section, - the first leg of the L-shaped window holder element extends along and opposite to an inner periphery of the window frame, wherein one of said guide recess and said projection is arranged in or attached to said first leg, - the second leg of the L-shaped window holder element extends along and opposite to a front side of the window frame, and wherein - the dampening element is arranged between the second leg of the L-shaped window holder element and the front side of the window frame and is arranged to be compressed and deformed by the second leg of the window holder element upon motion of the window and the window holder element in said first direction.