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Bifold Door Seal Repair The bifold door is an excellent addition to any house However, it requires proper installation and maintenance to function correctly. This includes a thorough inspection of the integrity, lubrication and a report of any issues to prevent them from occurring in the future. Bifold doors are designed to be slightly smaller than their frames to reduce sticking. This also means air can get in through the gaps. To stop this, you can install a weather seal. Damaged Seals A