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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 some may even begin to let in drafts. This is often because the hardware is falling out of alignment over time. The process of getting your bi-fold doors back in line is usually pretty simple. It's only a matter of a few adjustments. Misalignment Bi fold doors are beautiful homes, offering a wide range of benefits like seamless indoor-outdoor integration, as well as more light.