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Bifold Door Seal Repair Bifold doors are a great addition to any home, but they require regular maintenance and proper installation for correct operation. This includes a thorough integrity inspection along with lubrication and a detailed review of any issues to prevent them from occurring in the future. Bifold doors are made slightly smaller than their frames to reduce sticking. However, this could cause air to leak in through the gap. To stop this from happening, install an air seal.