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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 examination of the door, lubrication, and the report of any issues that could arise in the near future. To reduce sticking to reduce sticking, bifold doors are made to be ever-so slightly smaller than the frame. This also means air can enter through the gaps. Install a weather seal to st