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Bifold Door Seal Repair Bifold doors make a fantastic addition to any home, but they need proper installation and regular maintenance for proper operation. This includes a thorough inspection of the lubrication system, as well as a report on any problems that could arise in the future. To reduce sticking to reduce sticking, bifold doors are made to be ever-so-slightly smaller than the frame. However, this can result in air leakage through the gap. Install a weather seal t