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Bifold Door Seal Repair Bifold doors are a great addition to any home, but they require proper installation and regular maintenance for correct operation. This includes a thorough inspection of the door, lubrication, and a report on any problems that may occur in the near future. Bifold doors are designed to be slightly smaller than their frames to minimize sticking. However, this also means that air can enter through the gap. To stop this from happening, install an air seal. Damaged Seals Seals