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Bifold Door Seal Repair The bifold door can be a wonderful addition to any house, but it requires proper installation and maintenance in order to work correctly. This includes a thorough examination, lubrication, and an assessment of any issues that might arise in the near future. Bifold doors are designed to be slightly smaller than their frames to reduce sticking. Unfortunately, this also means air can enter through the gap. To stop this, you can install a weather seal