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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 to ensure proper operation. This includes a thorough inspection of the integrity and lubrication, as well as a report of any problems to prevent them from happening in the future. Bifold doors are made slightly smaller than their frames in order to prevent sticking. This also means air can leak in through the gap. Install a weather seal to stop this problem. Damaged Se