Whenever a window or door is over 2 meters wide it is reccommended that the shutters are supported by a tracking system. They are ideal for patio doors and can be made to slide past each other as well as the usual folding system.
I cannot recommend this company highly enough. They were efficient, helpful, did exactly what they promised to do in the time scale they promised. We are thrilled with our new blinds, have recommended them to others who likewise are extremely pleased with the results.
diana n