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Bifold Door Seal Repair The bifold door is an excellent option for any home however, it needs proper installation and maintenance to function correctly. This includes a thorough integrity check along with lubrication and a detailed report of any issues to prevent them from happening in the future. To prevent sticking, bifold doors are designed to be ever-so-slightly smaller than the frame. Unfortunately, this also means air can enter through the gap. To fix this, install a weather seal. Damaged Seals A