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Bifold Door Seal Repair Bifold doors are a wonderful feature for any home, but they need proper installation and regular maintenance for proper operation. This includes a thorough integrity check, lubrication and a report of any issues to prevent them from occurring in the future. Bifold doors are designed to be slightly smaller than their frames in order to prevent sticking. Unfortunately, this can also lead to air leaking in through the gap. Install a weather seal to stop this problem. Seals that are