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Bifold Door Seal Repair The bifold door is an excellent addition to any home however, it needs proper installation and maintenance to function properly. This includes a thorough inspection of the integrity and lubrication, as well as a report of any issues to avoid them in the future. Bifold doors are designed slightly smaller than their frames in order to prevent sticking. This also means air can leak in through the gap. Install a weather seal to stop this problem. Seals that are damaged Weather strips and seals