A ventilation window comprising: - a frame; - at least one glass element located on the inside of a perimeter formed by the frame so that the glass element or a part of it forms a light opening area; - a ventilation device which has been installed in an installation housing inside the frame from the vertical side on the interior side and which is equipped with an elongated heat exchanger, comprising i)at least one blower-operated fresh air duct (65, 62A) for leading fresh air from the exterior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the exterior side and from the ventilation device further to the interior as inlet air through at least one outlet such as an orifice or nozzle located in the frame on the interior side; and ii) at least one blower-operated exhaust air duct (66, 62B) for leading exhaust air from the interior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the interior side and from the ventilation device further to the exterior as waste air through at least one outlet such as an orifice or nozzle located in the frame on the exterior side; and where the fresh air duct (65, 62A) runs over the entire distance between the inlet and outlet and the exhaust air duct (66, 62B) runs over the entire distance between the inlet and outlet inside the ventilation device and furthermore so that the fresh air duct (65, 62A) and the exhaust air duct (66, 62B) intersect in the heat exchanger; which ventilation window further comprises in the flow direction to the exhaust air duct (66, 62B) an outlet duct, which is in a drain connection to the exterior, after the duct of the heat exchanger for removing condensation water; the ventilation window is characterized in that: the outlet duct comprises an outlet tube. - a frame; - at least one glass element located on the inside of a perimeter formed by the frame so that the glass element or a part of it forms a light opening area; - a ventilation device which has been installed in an installation housing inside the frame from the vertical side on the interior side and which is equipped with an elongated heat exchanger, comprising i)at least one blower-operated fresh air duct (65, 62A) for leading fresh air from the exterior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the exterior side and from the ventilation device further to the interior as inlet air through at least one outlet such as an orifice or nozzle located in the frame on the interior side; and ii) at least one blower-operated exhaust air duct (66, 62B) for leading exhaust air from the interior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the interior side and from the ventilation device further to the exterior as waste air through at least one outlet such as an orifice or nozzle located in the frame on the exterior side; and where the fresh air duct (65, 62A) runs over the entire distance between the inlet and outlet and the exhaust air duct (66, 62B) runs over the entire distance between the inlet and outlet inside the ventilation device and furthermore so that the fresh air duct (65, 62A) and the exhaust air duct (66, 62B) intersect in the heat exchanger; i)at least one blower-operated fresh air duct (65, 62A) for leading fresh air from the exterior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the exterior side and from the ventilation device further to the interior as inlet air through at least one outlet such as an orifice or nozzle located in the frame on the interior side; and ii) at least one blower-operated exhaust air duct (66, 62B) for leading exhaust air from the interior to the ventilation device through at least one inlet such as an orifice or nozzle located in the frame on the interior side and from the ventilation device further to the exterior as waste air through at least one outlet such as an orifice or nozzle located in the frame on the exterior side;