Slats can range from 10 to 15 cm wide, so choose a style that’s complementary to the size of your window. Vertical blinds should cover the entire length of your window to provide maximum privacy and light control. Whether you choose an inside- or outside-mount style will determine the total amount of vertical space you’ll need. For inside mount carefully measure the inside of the window frame from top to bottom and from left to right, as well as the depth of the window. The vertical slats are textile materials with different types of colors and designs.