Windowfab uPVC Bi Fold Doors are considered to be the best alternative to sliding doors and old French doors. It has a folding sash which helps save space and yet provides a wide opening. It also has multiple lock system for security. They have top grade thermal and sound insulation and are also low maintenance. They are the only uPVC doors that open both ways and provide a modern look to your hose. This doors can be of 3,4,5,6 and 7 shutters with different opening patterns.