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Bifold Door Seal Repair The bifold door can be a wonderful option for any home However, it requires proper installation and maintenance to work correctly. This includes a thorough examination of the lubrication system, as well as an assessment of any issues that may occur in the future. Bifold doors are designed slightly smaller than their frames to reduce sticking. However, this also means that air can enter through the gaps. Install a weather seal to stop this problem. Se