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Bifold Door Seal Repair Bifold doors make a fantastic feature for any home, but they need regular maintenance and proper installation for correct operation. This includes a thorough inspection of the lubrication system, as well as an assessment of any issues that could arise in the future. To prevent sticking to reduce sticking, bifold doors are made to be a little smaller than the frame. However, this can cause air to leak in through the gap. To stop this from happening, install a