Abstract: A ventilation device for ventilating a room in a building, the building having a window with at least two essentially parallel panes of glass, the at least two panes of glass being arranged in a common frame, casement or sash, thus forming the window, e.g., a double window, where the at least two panes of glass are arranged with a distance, and thus appear with an air space between the panes of glass, the window further having an intake opening communicating with the air space and with either the interior or the exterior of the building, where the ventilation device further has a preheating unit with a first chassis and a first throttle, where the first chassis has a first opening communicating with the interior of the building, a second opening communicating with the exterior of the building and a third opening communicating with the air space.

Abstract: A ventilation device for ventilating a room in a building, the building having a window with at least two essentially parallel panes of glass, the at least two panes of glass being arranged in a common frame, casement or sash, thus forming the window, e.g., a double window, where the at least two panes of glass are arranged with a distance, and thus appear with an air space between the panes of glass, the window further having an intake opening communicating with the air space and with either the interior or the exterior of the building, where the ventilation device further has a preheating unit with a first chassis and a first throttle, where the first chassis has a first opening communicating with the interior of the building, a second opening communicating with the exterior of the building and a third opening communicating with the air space.

Abstract: The invention relates to a ventilation device for a window, having at least two essentially parallel panes of glass arranged in a common frame, thus forming a double window having an air space between the panes of glass, and an intake opening communicating with the air space and with either the interior or the exterior of a building, where the ventilation device also has a drive unit. Such a ventilation device has at least one air direction control unit arranged in connection with the window and where the air direction control unit (10) has a body, having a first throttle and a second throttle, and a device for operating the throttles between an open and a closed position. The body also has an opening communicating with the interior of said building, an opening communicating with the exterior of the building and a third opening communicating with the air space.