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Bi Fold Repairs - How to Properly Maintain and Repair Your Bi Fold Doors Many bi fold doors become difficult to open and may even start to let in a draft. The hardware could be out of alignment over time. Getting your bi-fold doors back in line is generally easy. All it takes is a few minor adjustments. Misalignment Bi-fold doors are a stunning addition to any home. They provide a range of advantages that include seamless indoor/outdoor integration as well in a greater amount o