Abstract: A ventilating screen for window openings of motor vehicle passenger compartments which provides for the circulation of fresh air into the passenger compartment while the motor vehicle is stopped and moving. The ventilating screen allows the window to be closed completely or partially while still in place in the window opening in the event of inclement weather, and to adjust the amount of air flow. Further, the ventilation screen is easily removable from the window opening with the window either open or closed. The method for fitting the screen to particular window openings provides for its universal application in vertually any motor vehicle, and the method of installing it in the vehicle window opening obviates any modification to the motor vehicle structure.