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Bifold Door Seal Repair Bifold doors are a wonderful feature for any home, but they need regular maintenance and proper installation for correct operation. This includes a thorough examination, lubrication, and the report of any issues that might arise in the future. To minimise sticking to prevent sticking, bifold doors are designed to be ever-so-slightly smaller than the frame. This also means air can get in through the gaps. To stop this, you can install an air seal. Damaged Seals Seals an