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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 begin to let in drafts. The hardware may have become out of place with time. The process of getting your bi-fold doors back in line is generally simple. All it takes is a few adjustments. Misalignment Bi-fold doors are a beautiful feature for any home. They provide a range of advantages such as seamless indoor/outdoor integration aswell