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Bifold Door Seal Repair The bifold door is an excellent addition to any house, but it requires proper installation and maintenance to work correctly. This includes a thorough inspection of the integrity and lubrication, as well as a report of any problems 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 get in through the gaps. Install an air seal to correct this problem. S