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Bifold Door Seal Repair Bifold doors are a wonderful addition to any home, but they need regular maintenance and proper installation for correct operation. This includes a thorough inspection of the door, lubrication, and a report on any problems that might arise in the future. To reduce sticking to prevent sticking, bifold doors are designed to be ever-so-slightly smaller than the frame. However, this also means that air can leak in through the gaps. To fix this, install an air seal. Damaged Seals The ability of a bi