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Bifold Door Seal Repair The bifold door is an excellent option for any home however, it needs proper installation and maintenance to function correctly. This includes a thorough inspection of the integrity, lubrication and a report of any problems to prevent them from occurring in the future. To minimise sticking to reduce sticking, bifold doors are made to be ever-so-slightly smaller than the frame. However, this also means that air can enter through the gaps. Install a weather seal to fix this i