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Bifold Door Seal Repair Bifold doors are a great feature for any home, but they require regular maintenance and installation to ensure proper operation. This includes a thorough integrity inspection and lubrication, as well as a report of any problems to avoid them in the future. Bifold doors are designed to be slightly smaller than their frames to minimize sticking. However, this also means that air can leak in through the gap. Install an air seal to correct this problem. Seals that are dam