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Bifold Door Seal Repair The bifold door is an excellent addition to any home, but it requires proper installation and maintenance to function correctly. This includes a thorough integrity inspection and lubrication, as well as a review of any issues to prevent them from occurring in the future. To prevent sticking to prevent sticking, bifold doors are designed to be a little smaller than the frame. Unfortunately, this also means air can enter through the gap. Install an air seal to correct this problem. Seals