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Bifold Door Seal Repair The bifold door can be a wonderful addition to any house however, it needs proper installation and maintenance in order to function correctly. This includes a thorough examination, lubrication, and a report on any problems that could arise in the future. To minimise sticking, bifold doors are designed to be a little smaller than the frame. However, this also means that air can get in through the gap. Install a weather seal to fix this issue. Damaged Seals Weather st