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Bifold Door Seal Repair Bifold doors are a wonderful addition to any home, but they require regular maintenance and proper installation to ensure proper operation. This includes a thorough examination of the lubrication system, as well as a report on any problems that could arise in the future. To minimise sticking, bifold doors are designed to be a little smaller than the frame. Unfortunately, this also means air can enter through the gaps. To fix this, install an air seal. Damaged Seals Seals an