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Bifold Door Seal Repair The bifold door can be a wonderful addition to any house However, it requires proper installation and maintenance in order to work correctly. This includes a thorough inspection of the integrity along with lubrication and a detailed report of any problems to avoid them in the future. Bifold doors are made slightly smaller than their frames to minimize sticking. However, this could lead to air leaking in through the gap. To fix this, install a weather seal. Damaged