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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 lubrication system, as well as an assessment of any issues that might arise in the future. To prevent sticking to prevent sticking, bifold doors are designed to be a little smaller than the frame. Unfortunately, this can also result in air leakage through the gap. Install a weather seal to stop this issue