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Bi Fold Repairs - How to Properly Maintain and Repair Your Bi Fold Doors Many bi-fold doors can become difficult to open, and some may even start to let in drafts. The hardware could have gotten out of alignment over time. The process of getting your bi-fold doors back in line is generally easy. All you need is a few adjustments. Misalignment Bi-fold doors can be a gorgeous feature for any home. They offer a variety of advantages, including seamless indoor/outdoor integration