F80W is a kind of embedded natural ventilator, the shell is made of aluminum, the profile does not have any protrusion, there are control parts inside the profile cavity, F8OW is installed above the glass, F9ow is installed below the glass, especially suitable for sliding windows, the lower profile of the outdoor side is designed to slope upward to ensure the natural upward flow of air, the indoor side profile is processed into a mosquito net shape to prevent insects.