How to installPull down the window and fix the rubber strip from the outside.Install a solar ventilating fan on the inside, and one end is attached to the gap of the rubber strip.Press the solar ventilating fan down against the window on the inside, and fit it with the gaps of the adhesive strips on both sides.Close the window with the hand-held ventilating fan, so that the positioning fins are fixed in the groove of the rubber strip.Adjust the angle of the solar panel to face the sun.