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Bifold Door Seal Repair Bifold doors are a wonderful addition to any home, but they need proper installation and regular maintenance for correct operation. This includes a thorough examination of the door, lubrication, and an assessment of any issues that could arise in the near future. Bifold doors are designed to be slightly smaller than their frames in order to prevent sticking. However, this can lead to air leaking in through the gap. To fix this, install an air seal. Damaged Seals Weather strips