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Bifold Door Seal Replacement Maintaining the proper seal of bifold doors is essential to maintaining the control of temperature, energy efficiency and the quality of the space. As with any door system, they can have problems. Over time, the rubber gasket seal could become flattened, become harder or brittle and less able to impede drafts. This can be easily fixed by replacing the seal with this kit. Frame Bifold doors let in a lot of light and let in more light to a space. They are also convenie