Wide Mullion Door panels exclusive to DIYShutters. These panels are each 1.5 metres wide and make a practical way to control light coming through a glass door opening. Total privacy can be achieved by closing the louvres at night and opening them during the day to have light and colour reflected into the room. The centre mullion, or vertical strip in the centre supports the louvres so this is possible. Note the panels are very clean looking and and one control rod controls the louvre opening from top to bottom.