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Bifold Door Seal Repair Bifold doors are a great addition to any home, but they need regular maintenance and proper installation for proper operation. This includes a thorough examination of the door, lubrication, and an assessment of any issues that might arise in the future. To prevent sticking to prevent sticking, bifold doors are designed to be a little smaller than the frame. However, this could cause air to leak in through the gap. Install a weather seal to stop this