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Bifold Door Seal Replacement Maintaining the proper seal of bifold doors is vital to maintain the control of temperature, energy efficiency and the quality of the area. Like any other door system they may have issues. Over time, the rubber gasket seal can become flat, become harder or brittle and lose its ability to impede drafts. This can be easily repaired using this seal replacement kit. Frame Bifold doors let in a lot of light and can open up an area. They can also be incredibly convenient if you want to