CURTAINWORKS.com First, select your favorite style shade, then choose an inside or outside mount. Each shade reaches 64” in length when fully extended. Full window coverage requires that your window length measurement not exceed 64” long. Shades are mounted inside of your window frame. They have a visually appealing clean look and will showcase your window molding. Allow at least a 3” depth from your wall to your window’s glass for shades to fit properly.