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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 door, lubrication, and the report of any issues that might arise in the future. Bifold doors are designed slightly smaller than their frames in order to prevent sticking. This also means air can enter through the gaps. To fix this, install an air seal. Damaged Seals The ability of a bif