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Bifold Door Seal Repair Bifold doors make a fantastic feature for any home, but they require regular maintenance and proper installation to ensure proper operation. This includes a thorough inspection, lubrication, and an assessment of any issues that may occur in the future. Bifold doors are made slightly smaller than their frames to reduce sticking. However, means that air can get in through the gaps. Install a weather seal to stop this problem. Damaged Seals Seals and weather strips a