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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 in order to function properly. This includes a thorough integrity check and lubrication, as well as a review of any issues to avoid them in the future. Bifold doors are designed to be slightly smaller than their frames to reduce sticking. Unfortunately, this also means air can leak in through the gap. To fix this, install an air seal. Damaged Seals