The Da-Lite Deluxe Model B Front Projection Screen (70x70") is a tensioned manual wall screen or a ceiling screen. It is ideal to be used in offices, training rooms, and conference rooms.These Da-Lite ceiling screens come with a built-in tensioning arm, which locks in place when the screen is extended to offer a flat and tensioned viewing surfaceThis projection screen surface can be angled with the pull chord in it to avoid keystoning, which may occur when the screen is suspended from ceiling or mounted with wall brackets