Each shutter panel is hinged to either a surrounding frame or to an adjacent panel. The normal folding configuration is for an equal number of panels to fold in opposite directions. For example if you opt for two shutter panels, one would fold left and one to the right; with four panels, two would fold left, two right and so on. If you would like your shutters to fold back 180 degrees onto an adjacent wall, the amount of wall space availabe may dictate the folding configuration. For example a 600mm window in your bedroom has a wardrobe just 100mm from the reveal on the left but lots of wall space on the right. You can choose one 600mm shutter which folds right and occupies approx. 600mm of wall space or alternatively you could bi-fold two 300mm shutters to the right and these will take up approx. 300mm of wall space when folded back-to-back.If you choose three panels in a window, two will bi-fold one way and just one the opposite way.