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Bi Fold Repairs - How to Properly Maintain and Repair Your Bi Fold Doors Many bifold doors are difficult to open and could even start to let in drafts. This is usually because the hardware is falling out of alignment over time. Getting -fold doors back in line is usually pretty easy. All you need is a few adjustments. Misalignment Bi-fold doors are a stunning feature for any home. They provide a wide range of advantages, including seamless indoor/outdoor integration