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Bifold Door Seal Repair The bifold door is an excellent option for any home, but it requires proper installation and maintenance in order to work correctly. This includes a thorough inspection of the integrity, lubrication and a report of any issues to prevent them from happening in the future. To prevent sticking to prevent sticking, bifold doors are designed to be ever-so slightly smaller than the frame. Unfortunately, this can also lead to air leaking in through the gap. Install a weather seal to fix this