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Bifold Door Seal Repair Bifold doors are a wonderful feature for any home, but they require regular maintenance and proper installation for proper operation. This includes a thorough integrity check, lubrication and a report of any problems to prevent them from happening in the future. Bifold doors are made slightly smaller than their frames to minimize sticking. Unfortunately, this can also lead to air leaking in through the gap. To fix this, install a weather seal. Seals that are damag