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Bifold Door Seal Replacement It is important to maintain the temperature control, energy efficiency, and overall quality of the space by keeping bifold doors sealed correctly. Like all door systems they may have issues. Over time, the rubber gasket seal can become flat and become brittle or harder and less able to stop drafts. This can be easily corrected with this replacement seal kit. Frame Bifold doors are fantastic for letting in plenty of light and opening up a room. They